Term
| What suffix do hydrogel materials end in? RGP materials? Name one exception. |
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Definition
filcon for hydrogels, focon for RGPs The exception is the first hydrogel material polymacon |
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Term
| What was the initial purpose of the 4 FDA groupings? |
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Definition
evaluating/approving solutions, became useful clinically as well |
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Term
What are the three wearing schedules? |
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Definition
1. Daily Wear 2. Extended Wear 3. Flexible Wear |
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Term
| What two things could a contact lens modality refer to? |
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Definition
1. Wearing schedule 2. Replacement schedule |
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Term
| What is the most common type of contact lens wear that we Rx for? |
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Definition
Daily wear, even though most SiHydrogel lenses are approved for extended wear |
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Term
| What is the maximum amount of wear time approved by the FDA for normal hydrogels? for Si-Hydrogels? |
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Definition
Normal Hydrogels is 7 days, 6 nights Si-Hydrogels is 30 days
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Term
| What does flexible wear mean? |
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Definition
| lenses worn over night occasionaly, what most patients do but don't admit to |
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Term
| What are most deposits on a normal contact lens? a Si-Hydrogel? |
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Definition
protein, most patients have a reasonably good lipid layer in their tear film Si-Hydrogels have more lipid than protein
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Term
| What are jelly bumps and what is another name for them? |
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Definition
a.k.a. Calcinate deposits, a mixture of Calcium, lipid, and cholesterol (both inorganic and organic components in the mixture) |
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Term
| Can jelly bumps be removed from the surface of a lens? |
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Definition
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Term
| What is the difference between disposable and conventional lenses according to FDA classification? |
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Definition
Disposable means that the lens is thrown away after it is taken off, while conventional means that the lens can be cleaned and reused. |
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Term
| How do we define conventional replacement? |
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Definition
| lenses replaced every six months to a year |
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Term
| Name three examples of conventional replacement lenses? |
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Definition
1) Durasoft 2) CIBA 3) Hydrosoft |
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Term
| Name an example of quarterly replacment lenses. What is the disadvantage of this replacement schedule? |
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Definition
1) Sunsoft multiples-usually used for toric 2) The disadvantage is the expense |
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Term
| Name 4 examples of monthly replacement lenses? |
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Definition
1) Frequency 55, 55 toric (Coopervision) 2) Focus monthly, Focus toric (CIBA) 3) Pure Vision (Bausch and Lomb) 4) Focus Night and Day (CIBA) 5) Proclear (Coopervision) only lens with FDA labelling for Dry eye use |
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Term
| What do most clinicians call two week replacements? |
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Definition
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Term
| What is the most prescribed category,based on the replacment schedule, of lenses? |
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Definition
| two week replacement schedule, often called disposables |
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Term
| What type of lens would be ideal for swimmers? |
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Definition
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Term
| What type of lens would most clinicians Rx to first time wearers? |
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Definition
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Term
| What type of lens would be ideal for part time contact lens wearers? |
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Definition
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