Contact Lenses MCQ Quiz With Answers

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| By Talia Tunstill
Talia Tunstill, optometry
Talia is a residency-trained optometric glaucoma specialist with over 3 years of clinical experience. She excels in ocular disease management, contact lenses, and peri-operative care, demonstrating a strong commitment to eye health and patient well-being.
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  • 1/60 Questions

    Which three components are evaluated when checking the physical fit of the lens?

    • Movement, Centration, Coverage
    • Base Curve, Diameter, and Rotation
    • Visual Acuity, Sagittal Depth, and Lens Dehydration
    • Lens position, Keratometry Mires, and Eyelid Interaction
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About This Quiz

Do you know about contact lenses and their functions? If yes, then play this "Contact Lenses MCQ Quiz With Answers" quiz and check your knowledge about the same. A contact lens is a thin, soft lens placed directly on the surface of the eyes. They can be worn to rectify vision problems or even for cosmetic purposes. This quiz will assess your knowledge regarding these lenses, how to maintain hygienic conditions for eye safety, what are the risk factors, and much more. Shall we begin it now? Good luck, dear!

Contact Lenses MCQ Quiz With Answers - Quiz

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  • 2. 

    What is the major source of oxygen for the endothelium?

    • Aqueous

    • Tears

    • Limbal vessels

    • Palpebral conjunctiva

    Correct Answer
    A. Aqueous
    Explanation
    The major source of oxygen for the endothelium is the aqueous humor. The aqueous humor is a clear fluid that fills the front portion of the eye, between the cornea and the lens. It provides nutrients and oxygen to the cornea and the endothelium, which is the innermost layer of the cornea. This oxygen supply is crucial for maintaining the health and function of the endothelium, which plays a vital role in maintaining the transparency and clarity of the cornea.

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  • 3. 

    You would expect to see a large lateral lag in a lens with which of the following characteristics?

    • Loose fitting

    • Steep base curve

    • Good centration

    • Conjunctival drag

    Correct Answer
    A. Loose fitting
    Explanation
    A loose fitting lens refers to a lens that does not fit tightly on the eye. When a lens is loose, it tends to move more easily and can cause a large lateral lag. Lateral lag refers to the sideways movement of the lens when the eye moves. Therefore, a lens with a loose fitting is expected to have a large lateral lag.

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  • 4. 

    What is true about curvature map

    • All of the above are true

    • Sagittal map assumes the center of the radius of that curvature is always on a central axis

    • Tangential curvature does not assume where the center of the radius is

    • Mean curvature eliminates corneal astigmatism in order to highlight underlying features

    Correct Answer
    A. All of the above are true
    Explanation
    The statement "all of the above are true" indicates that all the statements provided about the curvature map are correct. This means that the sagittal map assumes the center of the radius of that curvature is always on a central axis, the tangential curvature does not assume where the center of the radius is, and the mean curvature eliminates corneal astigmatism in order to highlight underlying features.

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  • 5. 

    Which of the following is a correct technique regarding hygiene and contact lenses?

    • Emptying the case, rinsing with disinfecting solution, and letting it air dry.

    • Replacing a contact lens case every 4-6 months.

    • Using hand sanitizer before insertion.

    • Digitally scrubbing the case with tap water.

    Correct Answer
    A. Emptying the case, rinsing with disinfecting solution, and letting it air dry.
    Explanation
    Emptying the case, rinsing with disinfecting solution, and letting it air dry is a correct technique regarding hygiene and contact lenses. This process helps to remove any debris or bacteria from the case, ensuring that the lenses are stored in a clean and safe environment. Replacing a contact lens case every 4-6 months is also a good practice to prevent the buildup of bacteria. Using hand sanitizer before insertion can help to minimize the risk of introducing bacteria to the eyes. However, digitally scrubbing the case with tap water is not recommended as it may introduce contaminants and potentially damage the case.

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  • 6. 

    What is the number one reason for a pt to discontinue cl wear?

    • Poor tear film

    • High re

    • Keratoconus

    • Peripheral corneal scar

    Correct Answer
    A. Poor tear film
    Explanation
    Poor tear film is the number one reason for a patient to discontinue contact lens wear. This is because a healthy tear film is essential for maintaining the comfort and clarity of contact lenses. If the tear film is inadequate, it can lead to dryness, discomfort, and irritation, making it difficult for the patient to continue wearing contact lenses. Without proper tear film, the lenses may not fit properly on the eyes, causing further discomfort and potential damage to the cornea. Therefore, addressing and improving tear film quality is crucial for successful and comfortable contact lens wear.

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  • 7. 

    Which contact lens stabilization technique would you expect to have a thicker inferior portion of the lens with reduced O2 transmissibility in the thick zone and use gravity and lid force to put the lens in position?

    • Peribalast

    • Prism balast

    • Truncation

    • Dynamic stabilization

    Correct Answer
    A. Prism balast
    Explanation
    Prism balast is the contact lens stabilization technique that would have a thicker inferior portion of the lens with reduced O2 transmissibility in the thick zone and use gravity and lid force to put the lens in position.

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  • 8. 

    All of the following are characteristics of POOR contact lens candidates EXCEPT:

    • High refractive errors

    • Dry eyes

    • Tobacco smokers

    • Medications

    Correct Answer
    A. High refractive errors
    Explanation
    The given question asks for a characteristic that is not associated with poor contact lens candidates. The correct answer is "high refractive errors." This means that individuals with high refractive errors can still be suitable candidates for contact lenses. The other options, such as dry eyes, tobacco smokers, and medications, are commonly considered as factors that may make someone a poor candidate for contact lenses.

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  • 9. 

    Pachymetry is a measurement of ______ and is used to assess _____.

    • Corneal thickness; corneal edema

    • Corneal thickness; astigmatism

    • Corneal curvature; RGP fit

    • Corneal curvature; corneal edema

    Correct Answer
    A. Corneal thickness; corneal edema
    Explanation
    Pachymetry is a measurement of corneal thickness and is used to assess corneal edema. This means that pachymetry is used to determine the thickness of the cornea, which can be an indicator of corneal edema, a condition characterized by swelling of the cornea. By measuring corneal thickness, pachymetry can help in diagnosing and monitoring corneal edema.

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  • 10. 

    What are contraindications for soft contact lenses? (Select 3)

    • Autoimmune disease

    • Antihistamine use

    • Irregular astigmatism

    • Occasional wear

    Correct Answer(s)
    A. Autoimmune disease
    A. Antihistamine use
    A. Irregular astigmatism
    Explanation
    The correct answer is autoimmune disease, antihistamine use, and irregular astigmatism. Autoimmune diseases can cause inflammation and dryness in the eyes, making them unsuitable for wearing soft contact lenses. Antihistamines can also cause dryness in the eyes, which can lead to discomfort when wearing contact lenses. Irregular astigmatism refers to an irregularly shaped cornea, which can cause vision distortion and make it difficult for soft contact lenses to fit properly. Occasional wear is not a contraindication for soft contact lenses, as long as proper care and hygiene are maintained.

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  • 11. 

    Considering the Correct RX is dispensed, All of the following are CAUSES of Foggy/Hazy Vision in “Contact Lens” EXCEPT:

    • Pt re

    • Deposited lens

    • Corneal edema

    • Desert climate

    Correct Answer
    A. Pt re
    Explanation
    b,c, and d are due to user error or environment

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  • 12. 

    All of the following are true EXCEPT:

    • The stimulus to accommodate in hyperopes increases as a lens is moved toward the eye

    • With specs, myopes have BI induced at near

    • With specs, hyperopes have BO induced at near

    • Myopes will have less minification with CLs

    Correct Answer
    A. The stimulus to accommodate in hyperopes increases as a lens is moved toward the eye
    Explanation
    The stimulus to accommodate in hyperopes does not increase as a lens is moved toward the eye. This statement is incorrect because hyperopes have difficulty focusing on near objects due to their shorter eyeball length, so the stimulus to accommodate actually decreases as a lens is moved closer to the eye. Hyperopes require converging lenses (BO) to help them focus on near objects.

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  • 13. 

    Your pt asks for some tips regarding insertion and removal. You tell them all of the following except

    • You should use OptiFree solution if you are allergic to Polyquad.

    • If you experience discomfort after insertion, remove the lens, check for inversion, and re-rinse the lens before reinsertion.

    • You should remove the CL from the temporal or inferior part of the eye, not directly off the cornea.

    • You should inspect the CL before inserting it in case it is dirty or inside out. 

    Correct Answer
    A. You should use OptiFree solution if you are allergic to Polyquad.
    Explanation
    optifree has polyquad in it

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  • 14. 

    Longstanding contact lens wearers are most likely to notice all of the following tear film changes EXCEPT:

    • Decreased tear meniscus

    • Decreased TBUT

    • Decreased levels of phospholipids

    • Increased tear pH

    Correct Answer
    A. Increased tear pH
    Explanation
    Longstanding contact lens wearers may experience various changes in their tear film due to the prolonged use of lenses. These changes can include a decreased tear meniscus, decreased tear break-up time (TBUT), and decreased levels of phospholipids. However, increased tear pH is not typically observed in longstanding contact lens wearers.

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  • 15. 

    Which of the following is NOT a physiological change associated with ACUTE lack of oxygen to the cornea?

    • Corneal neovascularization

    • Stromal edema

    • Epithelial microcysts

    • Endothelial folds

    Correct Answer
    A. Corneal neovascularization
    Explanation
    Corneal neovascularization is the growth of new blood vessels in the cornea, which is a response to chronic lack of oxygen. In acute lack of oxygen, the cornea does not have enough time to develop new blood vessels, so corneal neovascularization is not a physiological change associated with it. The other options, stromal edema, epithelial microcysts, and endothelial folds, are all physiological changes that can occur in response to acute lack of oxygen to the cornea.

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  • 16. 

    Which of the following will be the best type of lens for a first time wearer pt -2.00OD -2.25 OS with year round allergies

    • Dailies total 1

    • Bioinfinity toric

    • Air optix aqua

    • Acuvue oasys

    Correct Answer
    A. Dailies total 1
    Explanation
    daily disposables are ideal for allergies, heavy depositors, and occasional wearers

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  • 17. 

    A pt comes to your office for a cl exam. during the sle you see 0.5 mm of lumbal neovascularization. what should you do?

    • Monitor to prevent further neovascularization

    • Cl refit, discontinuation of cl or update material

    • Stop cl wear

    • Do nothing

    Correct Answer
    A. Monitor to prevent further neovascularization
    Explanation
    Based on the given information, the correct answer is to monitor the patient to prevent further neovascularization. Neovascularization refers to the growth of new blood vessels, which can be a sign of an underlying condition or a complication related to contact lens wear. By monitoring the patient regularly, the healthcare professional can assess the progression of the neovascularization and take appropriate actions if necessary, such as adjusting the contact lens fit, changing the material, or advising the patient to discontinue contact lens wear. Simply doing nothing may lead to worsening of the condition, so monitoring is essential.

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  • 18. 

    All of the choices are possible tx of dryness that can be experienced with soft lenses except which one?

    • Vitamin D supplements

    • Hydrogen peroxide care system

    • Punctal plug

    • Lens material that exhibit increased surface wettability

    Correct Answer
    A. Vitamin D supplements
    Explanation
    The question asks for the option that is not a possible treatment for dryness experienced with soft lenses. Vitamin D supplements are not a treatment for dryness in the context of soft lenses. Vitamin D supplements are typically taken to address deficiencies in the body and promote overall health, but they do not directly treat dryness in the eyes caused by soft lenses. Therefore, vitamin D supplements are the correct answer.

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  • 19. 

    Which of the following are true regarding binocular and accommodative status? (select 2)

    • Myopes must accommodate and converge more with CLs than specs

    • Hyperopes must accommodate and converge less with CLs than specs

    • Myopes must accommodate and converge less with CLs than specs

    • Hyperopes must accommodate and converge more with Cls than specs

    Correct Answer(s)
    A. Myopes must accommodate and converge more with CLs than specs
    A. Hyperopes must accommodate and converge less with CLs than specs
    Explanation
    Myopes, who have nearsightedness, need to accommodate and converge more with contact lenses (CLs) compared to wearing spectacles. This is because contact lenses sit directly on the eye, causing the myopic eye to exert more effort to focus on near objects. On the other hand, hyperopes, who have farsightedness, need to accommodate and converge less with contact lenses compared to wearing spectacles. This is because contact lenses correct the hyperopic eye's focusing power, reducing the need for accommodation and convergence. Therefore, the statement that myopes must accommodate and converge more with CLs than specs and hyperopes must accommodate and converge less with CLs than specs is correct.

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  • 20. 

    A pt comes in for a contact lens fu. they are satisfied with the comfort and visual quality of the lenses and are compliant with their replacement and disinfection routine that you set up for them. However, you find out they have been swimming in freshwater with them during their underwater basket weaving lessons. you educate them on the risk of infection by a certain bacteria when using cl in freshwater, but they insist that they need them to clearly see. knowing all of this, you want to change their current chemical disinfection solution to one that will very likely be effective against bacteria you are concerned about. what solution do you tell them to use?

    • Revitalens

    • Aquify

    • Opti-free puremoist

    • Two of the above will work

    Correct Answer
    A. Two of the above will work
    Explanation
    The correct answer is "two of the above will work" because both Revitalens and Opti-Free Puremoist are effective against bacteria that may be present in freshwater. By changing their current chemical disinfection solution to either of these options, the patient can continue to wear their contact lenses while reducing the risk of infection.

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  • 21. 

    Which of the following is not a characteristic of a tight lens?

    • Clear vision occurs immediately after a blink

    • Blur vision occurs after a full bliimk

    • Can buckle /wrinkle centrally

    • Little to no mvmnt or lag

    Correct Answer
    A. Blur vision occurs after a full bliimk
    Explanation
    A tight lens is typically associated with clear vision immediately after a blink, little to no movement or lag, and the ability to buckle or wrinkle centrally. However, blur vision occurring after a full blink is not a characteristic of a tight lens.

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  • 22. 

    Which of the following is NOT a tear film surface abnormality?

    • Acne rosacea

    • Lid retraction

    • Scar tissue formation

    • Ptosis

    Correct Answer
    A. Acne rosacea
    Explanation
    Acne rosacea is a chronic skin condition that primarily affects the face, causing redness, pimples, and visible blood vessels. It is not a tear film surface abnormality because it does not directly affect the tear film or its production. Tear film surface abnormalities typically involve issues with the composition or stability of the tear film, such as dry eye syndrome or meibomian gland dysfunction. Therefore, acne rosacea is the correct answer as it does not fit the criteria of a tear film surface abnormality.

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  • 23. 

    A patient comes into your office and is complaining of stinging upon insertion of their contact lenses with noticeable injection. The patient is currently using Re-Nu Fresh contact lens solution. Which of the following is the best option of care for your patient?

    • Recommend using Opti-Free PureMoist by Alcon to replace current contact solution.

    • Recommend using Biotrue by Baush & Lomb to replace current contact solution.

    • Recommend Sensitive Eyes by Baush & Lomb to replace current contact solution.

    • Tell the patient to discontinue use of contact lenses.

    Correct Answer
    A. Recommend using Opti-Free PureMoist by Alcon to replace current contact solution.
    Explanation
    The patient is experiencing stinging and injection upon insertion of their contact lenses, indicating that their current contact lens solution may be causing irritation. The best option of care would be to recommend using Opti-Free PureMoist by Alcon to replace the current contact solution. This solution is known for its moisturizing properties and is designed to provide comfort and hydration for contact lens wearers. By switching to Opti-Free PureMoist, the patient may experience less stinging and irritation during lens insertion.

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  • 24. 

    Regarding magnification effects, myopes (select 2)

    • Often report things look larger with CLs

    • Will have less minification with CLs

    • Often report things look smaller with CLs

    • Will have less magnification with CLs

    Correct Answer(s)
    A. Often report things look larger with CLs
    A. Will have less minification with CLs
    Explanation
    Myopes, or nearsighted individuals, often report things looking larger with contact lenses (CLs) because the lenses correct their blurry vision, making objects appear clearer and closer. Additionally, myopes will have less minification with CLs, meaning that objects will not appear smaller as they would without corrective lenses.

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  • 25. 

    Which of the following is true of soft contact lenses?

    • HEMA materials have a greater DK with a lower water content

    • Sihys have a greater Dk with low water content and low silicone content

    • Sihys have a greater Dk with high water content and low silicone content

    • Sihys have a greater dk with high silicone content and low water content

    Correct Answer
    A. Sihys have a greater dk with high silicone content and low water content
    Explanation
    H in hema: hydro so high water content

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  • 26. 

    A patient is approved for a 1 year supply of Acuvue Oasys biweekly contact lenses. If each box contains 6 contact lenses, how many boxes need to be ordered to fulfill this request?

    • 2 boxes total

    • 4 boxes total

    • 8 boxes total

    • 12 boxes total

    Correct Answer
    A. 8 boxes total
    Explanation
    (4weeks/mo)(12 mo/yr)= 48 wks/yr (1 cl/2wk)(48 wk)= 24 cl (24 cl)(1 box/6cl)= 4 boxes/eye 8 boxes total

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  • 27. 

    Which of the following symptoms would be seen in a patient whose cornea has less oxygen consumption (due to CL abuse) (select 2)

    • Microcysts present

    • Shield ulcers

    • Endothelial folding

    • Purulent discharge

    Correct Answer(s)
    A. Microcysts present
    A. Endothelial folding
    Explanation
    A patient with less oxygen consumption in the cornea due to contact lens abuse may exhibit microcysts and endothelial folding. Microcysts are small fluid-filled spaces that form within the cornea as a result of chronic hypoxia, which occurs when the cornea does not receive enough oxygen. Endothelial folding refers to the folding or pleating of the endothelial layer of the cornea, which can also be caused by prolonged hypoxia. These symptoms are indicative of corneal damage and can be seen in patients who abuse contact lenses by wearing them for extended periods without proper oxygenation.

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  • 28. 

    Select the incorrect statement:

    • The 3 sources of O2 to the cornea are lipis, iris, vasculature and eyelid vasculature

    • The lower the H20 content in a SiHy contact lens the higher the Dk value

    • In Benjamins classification of oxygen permeability/ transmission a high Dk is 31-60

    • The tear pump supplies oxygen better when the eyes are open then while asleep

    Correct Answer
    A. The 3 sources of O2 to the cornea are lipis, iris, vasculature and eyelid vasculature
  • 29. 

    Which is not an advantage of soft contact lenses?

    • Quality of vision

    • Little movement

    • Wettability

    • Simple to fit

    Correct Answer
    A. Quality of vision
    Explanation
    Soft contact lenses provide several advantages, such as little movement, wettability, and being simple to fit. However, the quality of vision is not one of these advantages. While soft contact lenses can correct vision, they may not provide the same level of visual acuity as glasses or rigid gas permeable lenses. This is because soft lenses are more prone to distortions and may not provide as crisp and clear vision as other options. Therefore, the quality of vision is not an advantage of soft contact lenses.

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  • 30. 

    Which of the following is FALSE regarding corneal curvature:

    • Corneal curvature is flattest at its apex

    • Corneal curvature flattens as it transitions into the sclera

    • Corneal curvature and scleral curvature are usually the same

    • The cornea does not have a perfect spherical curvature at any location

    Correct Answer
    A. Corneal curvature is flattest at its apex
    Explanation
    The corneal curvature is not flattest at its apex. The cornea is actually steepest at its apex, which is the center of the cornea. As the cornea transitions into the sclera, it gradually flattens. The corneal curvature and scleral curvature are usually not the same, as the sclera has a different shape and curvature compared to the cornea. Additionally, the cornea does not have a perfect spherical curvature at any location, as it has a slightly asymmetrical shape.

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  • 31. 

    What should you not do if you have a loose lens

    • Steepen the base curve

    • Change to a larger diameter

    • Change to a smaller diameter

    • Make sure the lens is not inside out

    Correct Answer
    A. Change to a smaller diameter
    Explanation
    If you have a loose lens, changing to a smaller diameter would not be the correct solution. A smaller diameter would only make the lens fit even looser, potentially causing discomfort and poor vision. Instead, you should consider changing to a larger diameter to ensure a better fit and stability for the lens.

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  • 32. 

    Which of the following are NOT true regarding corneal topography?

    • A superior shift on the topographer is indicative of keratoconus.

    • The cornea does not have a perfectly spherical curvature at any point.

    • Irregular astigmatism is also known as nonorthogonal.

    • Typically, the right and left corneas are symmetrical mirror images of each other.

    Correct Answer
    A. A superior shift on the topographer is indicative of keratoconus.
    Explanation
    A superior shift on the topographer is not indicative of keratoconus. Keratoconus is a condition characterized by a cone-shaped bulge in the cornea, which causes vision problems. A superior shift on the topographer refers to a displacement of the corneal shape towards the superior (upper) part of the eye. This shift can be caused by various factors, such as eyelid pressure or contact lens wear, and is not specific to keratoconus. Therefore, a superior shift on the topographer is not a reliable indicator of keratoconus.

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  • 33. 

    Which systemic condition is associated with dry eyes? (multiple select)

    • Keratoconjunctivitis sicca

    • Rheumatoid arthritis

    • Thyroid conditions

    • High blood pressure

    Correct Answer(s)
    A. Keratoconjunctivitis sicca
    A. Rheumatoid arthritis
    A. Thyroid conditions
    Explanation
    Keratoconjunctivitis sicca, also known as dry eye syndrome, is a systemic condition associated with dry eyes. Rheumatoid arthritis, an autoimmune disease, can also cause dry eyes as a result of inflammation. Thyroid conditions, such as hypothyroidism or Graves' disease, can lead to dry eye symptoms due to hormonal imbalances. High blood pressure, however, is not directly associated with dry eyes.

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  • 34. 

    Which of these presbyopic pts will most likely be able to see better at near without an add power?

    • Hyperopic pt wearing CLs

    • Myopic pt wearing glasses

    • Hyperopic pt wearing glasses

    • Myopic pt wearing Cls

    Correct Answer
    A. Hyperopic pt wearing CLs
    Explanation
    A hyperopic patient wearing contact lenses is most likely to see better at near without an add power because contact lenses move with the eye, allowing for a wider field of vision and a more natural focusing ability. This helps to correct the hyperopia and allows for better near vision without the need for additional reading glasses.

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  • 35. 

    Which of the following statements about mucin is correct?

    • A mucin deficiency can result in dry spots in the tear film

    • A mucin deficiency can result in insufficient tear meniscus

    • The inner mucin layer is produced by the goblet cells, glands of Manz, and crypts of henle

    • The outer mucin layer is produced by the tarsal gland, gland of zeis, and gland of moll

    Correct Answer
    A. A mucin deficiency can result in dry spots in the tear film
    Explanation
    inner layer is glycocalyx produced by epithelial cells
    outer is goblet cells, manz glands and crypts of henle
    insufficent tear meniscus: aq deficiency

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  • 36. 

    Which of the following is an incorrect statement regarding oxidative disinfectants?

    • Someone sensitive to the preservatives in chemical disinfectants should be cautious of the preservatives in oxidative disinfectants

    • Like chemical disinfectants, oxidative disinfectants do not change the length of the lens life

    • Water and oxygen are the byproducts of hydrogen peroxide once it has been catalyzed

    • Contact lenses that have been cleaned and bleached for two hours in oxidative disinfectants should not be placed in the eye

    Correct Answer
    A. Someone sensitive to the preservatives in chemical disinfectants should be cautious of the preservatives in oxidative disinfectants
    Explanation
    This statement is incorrect because oxidative disinfectants do not contain preservatives. Unlike chemical disinfectants, oxidative disinfectants do not require the use of preservatives to maintain their stability and effectiveness. Therefore, someone who is sensitive to the preservatives in chemical disinfectants does not need to be cautious of the preservatives in oxidative disinfectants.

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  • 37. 

    Which of the following management techniques can cure dry eye?

    • None of the above

    • Punctal plugs

    • Artificial tears

    • Warm compresses

    Correct Answer
    A. None of the above
    Explanation
    you're not likely to cure the problem

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  • 38. 

    What causes excessive movement when wearing soft contact lenses?

    • Deposited lenses

    • Corneal edema

    • Poor tear quality/quantity

    • Dryness

    Correct Answer
    A. Deposited lenses
    Explanation
    Excessive movement when wearing soft contact lenses can be caused by deposited lenses. Deposits can accumulate on the surface of the lenses over time, causing them to become less smooth and slippery. This can lead to increased friction between the lenses and the eye, resulting in excessive movement. Regular cleaning and proper maintenance of the lenses can help prevent deposits from building up and minimize this issue.

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  • 39. 

    A contact lens wearer comes to your office complaining of red, painful eyes for past 2 days and is very worried about an Internet article saying it could be "an amoeba". Upon thorough case history, you find out the pair of contact lenses are 4 months old and patient sleeps in them 5 days out of the week. In addition, the patient uses a saline solution to clean the lenses, reports no tap water is ever used to clean, doesn't swim/shower in contacts. What should be thought of immediately BEFORE a SLE? (SELECT 2)

    • Assume acanthamoeba, treat accordingly.

    • Educate patient about saline solutions not having ability to disinfect, to switch to multipurpose solutions, and proper lens hygiene.

    • In the future, recommend Opti-free express for acanthamoeba disinfection since patient is worried about it.

    • Advise patient to discontinue using saline solution since it is more expensive.

    • Assume bacterial infection, treat accordingly.

    Correct Answer(s)
    A. Educate patient about saline solutions not having ability to disinfect, to switch to multipurpose solutions, and proper lens hygiene.
    A. Assume bacterial infection, treat accordingly.
    Explanation
    saline= cheap acanthamoeba= more likely when swim in lenses

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  • 40. 

    A pt is asking about the advantages of soft cl, which of the following would you mention? (2)

    • Initial comfort

    • Durability

    • Less prone to deposits

    • Hard to dislodge

    Correct Answer(s)
    A. Initial comfort
    A. Hard to dislodge
    Explanation
    The advantages of soft contact lenses include initial comfort and being hard to dislodge. Soft lenses are known for their comfort, as they are made from flexible materials that conform to the shape of the eye. Additionally, they have a lower risk of dislodging compared to rigid lenses, making them more convenient and secure for wearers.

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  • 41. 

    Which of the following tests are used to evaluate the quantity of the tear film? (multiple select)

    • Slit lamp observation

    • Schirmer test

    • TBUT

    • Phenol red thread test

    Correct Answer(s)
    A. Schirmer test
    A. Phenol red thread test
    Explanation
    The Schirmer test and the phenol red thread test are both used to evaluate the quantity of the tear film. The Schirmer test measures the amount of tears produced by placing a small strip of filter paper inside the lower eyelid, while the phenol red thread test measures tear production by using a thread that changes color when it comes into contact with tears. Both tests are commonly used in ophthalmology to assess tear production and diagnose conditions such as dry eye syndrome.

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  • 42. 

    Which sources contribute the most oxygen to the cornea when the eye is CLOSED?

    • Limbal vessels

    • Palpebral conjunctiva

    • Aqueous

    • Two of the above

    • All of the above supply equal amounts of oxygen

    Correct Answer
    A. Two of the above
    Explanation
    PC=Aq>LV
    the aq and palpebral conj each suuply roughly the same amount of oxygen

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  • 43. 

    Which of the following is incorrect?

    • During the inspection test saucer shape is inverted

    • When teaching a pt to insert cl , they should use their dominant hand for more control

    • When the practioner inserts the lens, they should have the pt slowly look around before having the pt blink gently

    • Each time the lenses are inserted, the case should be disinfected and air dried

    Correct Answer
    A. Each time the lenses are inserted, the case should be disinfected and air dried
    Explanation
    While it's important to regularly clean and disinfect contact lens cases, it's not necessary to disinfect and air dry the case each time the lenses are inserted. Instead, the case should be cleaned and disinfected regularly as per the manufacturer's instructions, typically at least once a day, and replaced every few months.

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  • 44. 

    Which of the following is not a hygienic practice for contact lens wearers?

    • Quickly washing your hands before insertion and removal of contact lenses

    • Replacing cosmetics after 5 months

    • Putting contact lenses in new solution after every lens removal

    • Cleaning your contact lens case every other day with soap and water

    Correct Answer
    A. Replacing cosmetics after 5 months
    Explanation
    Cosmetics, such as eye makeup and solutions, should be replaced regularly to prevent bacterial growth and reduce the risk of eye infections. Waiting for 5 months before replacing cosmetics increases the risk of contamination and infection. Therefore, it is not a hygienic practice for contact lens wearers.

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  • 45. 

    What are possible contraindication for contact lens wear? (select 2)

    • Corneal infiltrates

    • Fuchs endothelial dystrophy

    • Corneal scarring

    • <2mm neovascularization of the cornea

    Correct Answer(s)
    A. Corneal infiltrates
    A. Fuchs endothelial dystrophy
    Explanation
    Possible contraindications for contact lens wear include corneal infiltrates and Fuchs endothelial dystrophy. Corneal infiltrates refer to the presence of white blood cells in the cornea, which can be a sign of infection or inflammation. Fuchs endothelial dystrophy is a progressive disease that affects the cells lining the inner layer of the cornea, leading to vision problems. Both of these conditions can potentially worsen with contact lens wear, making it important to avoid wearing contact lenses in these cases.

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  • 46. 

    The pts manifest refraction is -3.50-1.25x180. You correctly provide an initial diagnostic toric lens (based on a 12 mm vertex distance) that rotates 10 degrees CCW on the pts eye. what is the final CL rx?

    • -3.50-0.75x170

    • -3.50-1.00x170

    • -3.50-1.25x170

    • -3.50-0.75x010

    Correct Answer
    A. -3.50-0.75x170
    Explanation
    LARS (RS)

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  • 47. 

    Which of the following statements about soft toric CLs are TRUE (select 3):

    • Astigmats see WORSE in Soft toric lenses than GPs

    • Oblique axis degrades VA more than ATR or WTR

    • Soft toric CLs start at -0.75DC

    • Soft torics "mask" cyl

    Correct Answer(s)
    A. Astigmats see WORSE in Soft toric lenses than GPs
    A. Oblique axis degrades VA more than ATR or WTR
    A. Soft toric CLs start at -0.75DC
  • 48. 

    A common complication of wearing hydrogel lenses, not sihys, overnight is

    • Myopic shift

    • Mucin balls

    • Microbial keratitis

    • Corneal erosions

    Correct Answer
    A. Myopic shift
    Explanation
    Wearing hydrogel lenses, not sihys, overnight can lead to a common complication known as myopic shift. This refers to a temporary change in vision where the person becomes more nearsighted. This can occur due to the cornea molding to the shape of the lens, resulting in a change in the way light is focused on the retina. However, it is important to note that this is a reversible condition and usually resolves once the lenses are removed and the eyes have had time to recover.

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  • 49. 

    Choose the true statement (2)

    • The contact lens case should be replaced every 1-3 months

    • Before insertion or removal, it is best to use mild soaps that do not contain deodorants, creams, lanolin, or oils.

    • nasal scleral method, temporal scleral method, and inferior scleral method are the best methods of removal.

    • A bowl shaped contact lens during inspect test will lead to discomfort, blurred vision, and excessive movement in the eye.

    Correct Answer(s)
    A. The contact lens case should be replaced every 1-3 months
    A. Before insertion or removal, it is best to use mild soaps that do not contain deodorants, creams, lanolin, or oils.
    Explanation
    The given answer is correct because it includes two true statements. The first statement states that the contact lens case should be replaced every 1-3 months, which is important for maintaining good hygiene and preventing the buildup of bacteria. The second statement advises using mild soaps without certain ingredients for insertion or removal of contact lenses, which helps to avoid irritation or damage to the eyes.

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Quiz Review Timeline (Updated): Mar 29, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 29, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 11, 2018
    Quiz Created by
    Talia Tunstill
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