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.
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.
Increased fluorescein staining
Decreased fluorescein staining
Increased lens deposition
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
Using tap water on the contact lenses
Leaving the cap open on solution bottles
Applying makeup before inserting contact lens
Applying makeup before inserting contact lens
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.
Steep base curve
High blood pressure
High refractive errors
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
Movement, Centration, Coverage
Base Curve, Diameter, and Rotation
Visual Acuity, Sagittal Depth, and Lens Dehydration
Lens position, Keratometry Mires, and Eyelid Interaction
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.
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
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
A myope will need more power with spec than contact lens
A plus lens is more effective when you move it closer to the eye
The "edge lift" with rigid lenses allows for tear exchange and better capillary attration
A hyperope with convergence insufficiency will prefer specs over cl
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
Fuchs endothelial dystrophy
Poor tear film
Peripheral corneal scar
Monitor to prevent further neovascularization
Cl refit, discontinuation of cl or update material
Stop cl wear
Corneal thickness; corneal edema
Corneal thickness; astigmatism
Corneal curvature; RGP fit
Corneal curvature; corneal edema
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
Scar tissue formation
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
None of the above
Dailies total 1
Air optix aqua
Seen as white dots across the surface of the lens
Seen as a whitish haze across the surface of the lens
Most common deposit type
Most common inorganic deposit type
Not readily seen in hydrogels
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
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
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.
Thermal disinfection is cheap but hard to find
Oxidative disinfection is very effective in disinfection and protein removal, but decreases lens life expectancy
Up to 99% of acanthamoeba and over 90% bacteria are removed by rubbing with the use of chemical disinfectant solution
Stinging upon contact lens insertion, itch and injection are common signs of solution sensitivity most often caused by preservatives in oxidative disinfectant solution
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.
Requires neutralization by tablet or disc in 1-2 hrs
Not as effective in disinfection and protein removal
Contains preservatives that may irritate the eye
Disadvantages include cost and punctate keratitis
2 boxes total
4 boxes total
8 boxes total
12 boxes total
Group 4 should avoid heat disinfection, sorbic acid and potassium sorbate, lens parameters may be sensitive to changes in pH
Group 3 includes many disposable or planned replacement lenses
Group 2 can be discolored by preservatives containing sorbic acid and potassium sorbate
Group 1 contain low water and nonionic polymers
Less prone to deposits
Hard to dislodge
Lactic acid accumulation
With steeper base curves, lens movement increases
Lens centration is assessed in primary gaze when blinking
Bubbles at limbus indicate flat fitting lens
Clear vision occurs as the eye remains open for a loose 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
Steepen the base curve
Change to a larger diameter
Change to a smaller diameter
Make sure the lens is not inside out
Decreased tear meniscus
Decreased levels of phospholipids
Increased tear pH
Poor tear quality/quantity
Slit lamp observation
Phenol red thread test
Two of the above
All of the above supply equal amounts of oxygen
Hyperopic pt wearing CLs
Myopic pt wearing glasses
Hyperopic pt wearing glasses
Myopic pt wearing Cls
The nasal cornea flattens at a faster rate than the temporal conrea
The right and left corneas are symmetric direct images of each other
The temporal cornea flattens at a faster rate than the nasal cornea
The right and left corneas are symmetric mirror images of each other
Quality of vision
Simple to fit
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
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
Vitamin D supplements
Hydrogen peroxide care system
Lens material that exhibit increased surface wettability
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
Two of the above will work