Contact Lenses MCQ Quiz With Answers
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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!
- 1.
Which of the following is NOT a physiological change associated with ACUTE lack of oxygen to the cornea?
- A.
Corneal neovascularization
- B.
Stromal edema
- C.
Epithelial microcysts
- D.
Endothelial folds
Correct Answer
A. Corneal neovascularizationExplanation
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.Rate this question:
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- 2.
Choose the true statement (2)
- A.
The contact lens case should be replaced every 1-3 months
- B.
Before insertion or removal, it is best to use mild soaps that do not contain deodorants, creams, lanolin, or oils.
- C.
nasal scleral method, temporal scleral method, and inferior scleral method are the best methods of removal.
- D.
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
B. 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.Rate this question:
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- 3.
Which of the following is a correct technique regarding hygiene and contact lenses?
- A.
Emptying the case, rinsing with disinfecting solution, and letting it air dry.
- B.
Replacing a contact lens case every 4-6 months.
- C.
Using hand sanitizer before insertion.
- D.
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.Rate this question:
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- 4.
Incomplete blinks in Hydrogen contact lens wear are linked to?
- A.
Increased fluorescein staining
- B.
Decreased fluorescein staining
- C.
Increased lens deposition
- D.
Cell redistribution
Correct Answer(s)
A. Increased fluorescein staining
C. Increased lens depositionExplanation
Incomplete blinks in Hydrogen contact lens wear can lead to increased fluorescein staining and increased lens deposition. When a person does not fully close their eyelids during a blink, the tears that normally spread across the surface of the eye and contact lens are not distributed evenly. This can result in areas of the eye and lens being exposed to less tears, leading to increased fluorescein staining. Additionally, incomplete blinks can also cause a buildup of debris and proteins on the lens, increasing lens deposition.Rate this question:
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- 5.
Which of the following is FALSE regarding corneal curvature:
- A.
Corneal curvature is flattest at its apex
- B.
Corneal curvature flattens as it transitions into the sclera
- C.
Corneal curvature and scleral curvature are usually the same
- D.
The cornea does not have a perfect spherical curvature at any location
Correct Answer
A. Corneal curvature is flattest at its apexExplanation
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.Rate this question:
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- 6.
A patient comes in for a contact lens exam. The patient complains that her vision through the lens is not as good as it used to be. She is wearing the contact lenses to the exam so you examine them through the slit lamp. You see what looks like orange/red rust spots on the lens. What is the deposit on the lens and what is the most likely reason those spots are on her contacts?
- A.
Iron deposition
- B.
Using tap water on the contact lenses
- C.
Jelly Bumps
- D.
Leaving the cap open on solution bottles
- E.
Applying makeup before inserting contact lens
- F.
Applying makeup before inserting contact lens
Correct Answer(s)
A. Iron deposition
B. Using tap water on the contact lensesExplanation
The orange/red rust spots on the patient's contact lenses are most likely caused by iron deposition. This could be due to the patient using tap water on the contact lenses, as tap water often contains minerals such as iron that can leave deposits on the lenses.Rate this question:
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- 7.
Which of the following are NOT true regarding corneal topography?
- A.
A superior shift on the topographer is indicative of keratoconus.
- B.
The cornea does not have a perfectly spherical curvature at any point.
- C.
Irregular astigmatism is also known as nonorthogonal.
- D.
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.Rate this question:
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- 8.
What are contraindications for soft contact lenses? (Select 3)
- A.
Autoimmune disease
- B.
Antihistamine use
- C.
Irregular astigmatism
- D.
Occasional wear
Correct Answer(s)
A. Autoimmune disease
B. Antihistamine use
C. Irregular astigmatismExplanation
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.Rate this question:
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- 9.
You would expect to see a large lateral lag in a lens with which of the following characteristics?
- A.
Loose fitting
- B.
Steep base curve
- C.
Good centration
- D.
Conjunctival drag
Correct Answer
A. Loose fittingExplanation
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.Rate this question:
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- 10.
Which systemic condition is associated with dry eyes? (multiple select)
- A.
Keratoconjunctivitis sicca
- B.
Rheumatoid arthritis
- C.
Thyroid conditions
- D.
High blood pressure
Correct Answer(s)
A. Keratoconjunctivitis sicca
B. Rheumatoid arthritis
C. Thyroid conditionsExplanation
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.Rate this question:
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- 11.
All of the following are characteristics of POOR contact lens candidates EXCEPT:
- A.
High refractive errors
- B.
Dry eyes
- C.
Tobacco smokers
- D.
Medications
Correct Answer
A. High refractive errorsExplanation
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.Rate this question:
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- 12.
Which of the following statements about soft toric CLs are TRUE (select 3):
- A.
Astigmats see WORSE in Soft toric lenses than GPs
- B.
Oblique axis degrades VA more than ATR or WTR
- C.
Soft toric CLs start at -0.75DC
- D.
Soft torics "mask" cyl
Correct Answer(s)
A. Astigmats see WORSE in Soft toric lenses than GPs
B. Oblique axis degrades VA more than ATR or WTR
C. Soft toric CLs start at -0.75DC -
- 13.
Which three components are evaluated when checking the physical fit of the lens?
- A.
Movement, Centration, Coverage
- B.
Base Curve, Diameter, and Rotation
- C.
Visual Acuity, Sagittal Depth, and Lens Dehydration
- D.
Lens position, Keratometry Mires, and Eyelid Interaction
Correct Answer
A. Movement, Centration, CoverageExplanation
When checking the physical fit of a lens, three components are evaluated: movement, centration, and coverage. Movement refers to the ability of the lens to move slightly on the eye with each blink, ensuring comfort and proper tear exchange. Centration refers to the position of the lens on the cornea, ensuring optimal visual acuity and minimizing potential complications. Coverage refers to the extent to which the lens covers the cornea, ensuring proper alignment and stability. These three components are crucial in determining the suitability and effectiveness of a lens for a specific individual.Rate this question:
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- 14.
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?
- A.
Recommend using Opti-Free PureMoist by Alcon to replace current contact solution.
- B.
Recommend using Biotrue by Baush & Lomb to replace current contact solution.
- C.
Recommend Sensitive Eyes by Baush & Lomb to replace current contact solution.
- D.
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.Rate this question:
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- 15.
Regarding magnification effects, myopes (select 2)
- A.
Often report things look larger with CLs
- B.
Will have less minification with CLs
- C.
Often report things look smaller with CLs
- D.
Will have less magnification with CLs
Correct Answer(s)
A. Often report things look larger with CLs
B. Will have less minification with CLsExplanation
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.Rate this question:
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- 16.
All of the following are true EXCEPT:
- A.
The stimulus to accommodate in hyperopes increases as a lens is moved toward the eye
- B.
With specs, myopes have BI induced at near
- C.
With specs, hyperopes have BO induced at near
- D.
Myopes will have less minification with CLs
Correct Answer
A. The stimulus to accommodate in hyperopes increases as a lens is moved toward the eyeExplanation
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.Rate this question:
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- 17.
Which of the following are true? (Select 2)
- A.
A myope will need more power with spec than contact lens
- B.
A plus lens is more effective when you move it closer to the eye
- C.
The "edge lift" with rigid lenses allows for tear exchange and better capillary attration
- D.
A hyperope with convergence insufficiency will prefer specs over cl
Correct Answer(s)
A. A myope will need more power with spec than contact lens
C. The "edge lift" with rigid lenses allows for tear exchange and better capillary attrationExplanation
A myope will need more power with spectacles than contact lenses because spectacles are positioned further from the eye, resulting in a greater need for corrective power. The "edge lift" with rigid lenses allows for tear exchange and better capillary attraction, which improves comfort and overall eye health.Rate this question:
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- 18.
Which of the following are true regarding binocular and accommodative status? (select 2)
- A.
Myopes must accommodate and converge more with CLs than specs
- B.
Hyperopes must accommodate and converge less with CLs than specs
- C.
Myopes must accommodate and converge less with CLs than specs
- D.
Hyperopes must accommodate and converge more with Cls than specs
Correct Answer(s)
A. Myopes must accommodate and converge more with CLs than specs
B. Hyperopes must accommodate and converge less with CLs than specsExplanation
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.Rate this question:
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- 19.
What are possible contraindication for contact lens wear? (select 2)
- A.
Corneal infiltrates
- B.
Fuchs endothelial dystrophy
- C.
Corneal scarring
- D.
<2mm neovascularization of the cornea
Correct Answer(s)
A. Corneal infiltrates
B. Fuchs endothelial dystrophyExplanation
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.Rate this question:
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- 20.
What is the number one reason for a pt to discontinue cl wear?
- A.
Poor tear film
- B.
High re
- C.
Keratoconus
- D.
Peripheral corneal scar
Correct Answer
A. Poor tear filmExplanation
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.Rate this question:
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- 21.
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?
- A.
Monitor to prevent further neovascularization
- B.
Cl refit, discontinuation of cl or update material
- C.
Stop cl wear
- D.
Do nothing
Correct Answer
A. Monitor to prevent further neovascularizationExplanation
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.Rate this question:
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- 22.
Pachymetry is a measurement of ______ and is used to assess _____.
- A.
Corneal thickness; corneal edema
- B.
Corneal thickness; astigmatism
- C.
Corneal curvature; RGP fit
- D.
Corneal curvature; corneal edema
Correct Answer
A. Corneal thickness; corneal edemaExplanation
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.Rate this question:
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- 23.
What is true about curvature map
- A.
All of the above are true
- B.
Sagittal map assumes the center of the radius of that curvature is always on a central axis
- C.
Tangential curvature does not assume where the center of the radius is
- D.
Mean curvature eliminates corneal astigmatism in order to highlight underlying features
Correct Answer
A. All of the above are trueExplanation
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.Rate this question:
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- 24.
Which of the following is NOT a tear film surface abnormality?
- A.
Acne rosacea
- B.
Lid retraction
- C.
Scar tissue formation
- D.
Ptosis
Correct Answer
A. Acne rosaceaExplanation
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.Rate this question:
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- 25.
Which of the following statements about mucin is correct?
- A.
A mucin deficiency can result in dry spots in the tear film
- B.
A mucin deficiency can result in insufficient tear meniscus
- C.
The inner mucin layer is produced by the goblet cells, glands of Manz, and crypts of henle
- D.
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 filmExplanation
inner layer is glycocalyx produced by epithelial cells
outer is goblet cells, manz glands and crypts of henle
insufficent tear meniscus: aq deficiencyRate this question:
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- 26.
Which of the following management techniques can cure dry eye?
- A.
None of the above
- B.
Punctal plugs
- C.
Artificial tears
- D.
Warm compresses
Correct Answer
A. None of the aboveExplanation
you're not likely to cure the problemRate this question:
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- 27.
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
- A.
Dailies total 1
- B.
Bioinfinity toric
- C.
Air optix aqua
- D.
Acuvue oasys
Correct Answer
A. Dailies total 1Explanation
daily disposables are ideal for allergies, heavy depositors, and occasional wearersRate this question:
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- 28.
A patient comes in complaining about their contact lenses. During the exam, you notice protein build up on their lenses. What possible FDA grouping could these contact lenses be? (select 2)
- A.
Group 1
- B.
Group 2
- C.
Group 3
- D.
Group 4
Correct Answer(s)
B. Group 2
D. Group 4Explanation
1 low water, nonionic 2 high water nonionic 3 low water ionic 4 high water ionic
low water content: less depositionRate this question:
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- 29.
Select the following true statements about protein deposits. (select 2)
- A.
Seen as white dots across the surface of the lens
- B.
Seen as a whitish haze across the surface of the lens
- C.
Most common deposit type
- D.
Most common inorganic deposit type
- E.
Not readily seen in hydrogels
Correct Answer(s)
B. Seen as a whitish haze across the surface of the lens
C. Most common deposit typeExplanation
common inorganic:Jelly bumpsRate this question:
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- 30.
Which of the following is true of soft contact lenses?
- A.
HEMA materials have a greater DK with a lower water content
- B.
Sihys have a greater Dk with low water content and low silicone content
- C.
Sihys have a greater Dk with high water content and low silicone content
- D.
Sihys have a greater dk with high silicone content and low water content
Correct Answer
D. Sihys have a greater dk with high silicone content and low water contentExplanation
H in hema: hydro so high water contentRate this question:
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- 31.
What is the major source of oxygen for the endothelium?
- A.
Aqueous
- B.
Tears
- C.
Limbal vessels
- D.
Palpebral conjunctiva
Correct Answer
A. AqueousExplanation
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.Rate this question:
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- 32.
Which of the following symptoms would be seen in a patient whose cornea has less oxygen consumption (due to CL abuse) (select 2)
- A.
Microcysts present
- B.
Shield ulcers
- C.
Endothelial folding
- D.
Purulent discharge
Correct Answer(s)
A. Microcysts present
C. Endothelial foldingExplanation
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.Rate this question:
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- 33.
Which of the following is incorrect?
- A.
During the inspection test saucer shape is inverted
- B.
When teaching a pt to insert cl , they should use their dominant hand for more control
- C.
When the practioner inserts the lens, they should have the pt slowly look around before having the pt blink gently
- D.
Each time the lenses are inserted, the case should be disinfected and air dried
Correct Answer
B. When teaching a pt to insert cl , they should use their dominant hand for more controlExplanation
The correct answer is "when teaching a pt to insert cl, they should use their dominant hand for more control." This statement is incorrect because when teaching a patient to insert contact lenses, it is recommended to use the non-dominant hand to hold the upper eyelid and lashes, while the dominant hand is used to insert the lens. This allows for better control and precision during the insertion process.Rate this question:
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- 34.
Your pt asks for some tips regarding insertion and removal. You tell them all of the following except
- A.
You should use OptiFree solution if you are allergic to Polyquad.
- B.
If you experience discomfort after insertion, remove the lens, check for inversion, and re-rinse the lens before reinsertion.
- C.
You should remove the CL from the temporal or inferior part of the eye, not directly off the cornea.
- D.
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 itRate this question:
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- 35.
Which of the following statements are incorrect regarding soft contact lens care and solutions? (select 2)
- A.
Thermal disinfection is cheap but hard to find
- B.
Oxidative disinfection is very effective in disinfection and protein removal, but decreases lens life expectancy
- C.
Up to 99% of acanthamoeba and over 90% bacteria are removed by rubbing with the use of chemical disinfectant solution
- D.
Stinging upon contact lens insertion, itch and injection are common signs of solution sensitivity most often caused by preservatives in oxidative disinfectant solution
Correct Answer(s)
B. Oxidative disinfection is very effective in disinfection and protein removal, but decreases lens life expectancy
D. Stinging upon contact lens insertion, itch and injection are common signs of solution sensitivity most often caused by preservatives in oxidative disinfectant solutionExplanation
oxidation is effective but does not affect lens life expectancy
oxidative solution does not use preservatives (h202 oxidized to h20)Rate this question:
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- 36.
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)
- A.
Assume acanthamoeba, treat accordingly.
- B.
Educate patient about saline solutions not having ability to disinfect, to switch to multipurpose solutions, and proper lens hygiene.
- C.
In the future, recommend Opti-free express for acanthamoeba disinfection since patient is worried about it.
- D.
Advise patient to discontinue using saline solution since it is more expensive.
- E.
Assume bacterial infection, treat accordingly.
Correct Answer(s)
B. Educate patient about saline solutions not having ability to disinfect, to switch to multipurpose solutions, and proper lens hygiene.
E. Assume bacterial infection, treat accordingly.Explanation
saline= cheap acanthamoeba= more likely when swim in lensesRate this question:
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- 37.
Which of the following statement is true regarding oxidative disinfection in soft contact lens?
- A.
Requires neutralization by tablet or disc in 1-2 hrs
- B.
Not as effective in disinfection and protein removal
- C.
Contains preservatives that may irritate the eye
- D.
Disadvantages include cost and punctate keratitis
Correct Answer
D. Disadvantages include cost and punctate keratitisExplanation
effective, no preservatives, neutralization in 4-6 hrsRate this question:
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- 38.
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?
- A.
2 boxes total
- B.
4 boxes total
- C.
8 boxes total
- D.
12 boxes total
Correct Answer
C. 8 boxes totalExplanation
(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 totalRate this question:
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- 39.
All of the following are true about soft contact lens material except:
- A.
Group 4 should avoid heat disinfection, sorbic acid and potassium sorbate, lens parameters may be sensitive to changes in pH
- B.
Group 3 includes many disposable or planned replacement lenses
- C.
Group 2 can be discolored by preservatives containing sorbic acid and potassium sorbate
- D.
Group 1 contain low water and nonionic polymers
Correct Answer
B. Group 3 includes many disposable or planned replacement lensesExplanation
group 4 include many disposable or planned replacement lensesRate this question:
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- 40.
A pt is asking about the advantages of soft cl, which of the following would you mention? (2)
- A.
Initial comfort
- B.
Durability
- C.
Less prone to deposits
- D.
Hard to dislodge
Correct Answer(s)
A. Initial comfort
D. Hard to dislodgeExplanation
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.Rate this question:
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- 41.
Which of the following are changes than occur in the corneal stroma due to contact lens wear? (pick 2)
- A.
Microcysts
- B.
Lactic acid accumulation
- C.
Polymegathism
- D.
Acidosis
Correct Answer(s)
B. Lactic acid accumulation
D. AcidosisExplanation
lactic acid accumulation, acidosis, thinning, neo, keratocyte loss, microdotsRate this question:
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- 42.
Select the correct statements about soft cls
- A.
With steeper base curves, lens movement increases
- B.
Lens centration is assessed in primary gaze when blinking
- C.
Bubbles at limbus indicate flat fitting lens
- D.
Clear vision occurs as the eye remains open for a loose lens
Correct Answer
D. Clear vision occurs as the eye remains open for a loose lensExplanation
centration is primary gaze not blinkingRate this question:
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- 43.
Which of the following is not a characteristic of a tight lens?
- A.
Clear vision occurs immediately after a blink
- B.
Blur vision occurs after a full bliimk
- C.
Can buckle /wrinkle centrally
- D.
Little to no mvmnt or lag
Correct Answer
B. Blur vision occurs after a full bliimkExplanation
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.Rate this question:
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- 44.
What should you not do if you have a loose lens
- A.
Steepen the base curve
- B.
Change to a larger diameter
- C.
Change to a smaller diameter
- D.
Make sure the lens is not inside out
Correct Answer
C. Change to a smaller diameterExplanation
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.Rate this question:
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- 45.
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?
- A.
Peribalast
- B.
Prism balast
- C.
Truncation
- D.
Dynamic stabilization
Correct Answer
B. Prism balastExplanation
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.Rate this question:
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- 46.
Considering the Correct RX is dispensed, All of the following are CAUSES of Foggy/Hazy Vision in “Contact Lens” EXCEPT:
- A.
Pt re
- B.
Deposited lens
- C.
Corneal edema
- D.
Desert climate
Correct Answer
A. Pt reExplanation
b,c, and d are due to user error or environmentRate this question:
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- 47.
Longstanding contact lens wearers are most likely to notice all of the following tear film changes EXCEPT:
- A.
Decreased tear meniscus
- B.
Decreased TBUT
- C.
Decreased levels of phospholipids
- D.
Increased tear pH
Correct Answer
D. Increased tear pHExplanation
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.Rate this question:
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- 48.
What causes excessive movement when wearing soft contact lenses?
- A.
Deposited lenses
- B.
Corneal edema
- C.
Poor tear quality/quantity
- D.
Dryness
Correct Answer
A. Deposited lensesExplanation
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.Rate this question:
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- 49.
Which of the following tests are used to evaluate the quantity of the tear film? (multiple select)
- A.
Slit lamp observation
- B.
Schirmer test
- C.
TBUT
- D.
Phenol red thread test
Correct Answer(s)
B. Schirmer test
D. Phenol red thread testExplanation
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.Rate this question:
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- 50.
Which sources contribute the most oxygen to the cornea when the eye is CLOSED?
- A.
Limbal vessels
- B.
Palpebral conjunctiva
- C.
Aqueous
- D.
Two of the above
- E.
All of the above supply equal amounts of oxygen
Correct Answer
D. Two of the aboveExplanation
PC=Aq>LV
the aq and palpebral conj each suuply roughly the same amount of oxygenRate this question:
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