Soft CLs Flashcards
Soft CLs are made of
Hydrophilic plastic polymers
Greater water means
Lower index of refraction
Greater flexability
Higher oxygen permeability
Why is surface ionocity important?
Affects solution compatibility and deposit formation
What kind of lenses are deposits attracted to?
Negative lenses because deposits are positively charged
What charge has better deposit resistance
Non ionic
Base curve is ___ than K readings due to larger diameter
Flatter
Which CLs have a larger OAD
Soft are larger than RGPs
What some CL parameters determined by manufacturers
Lens markings, lenticulation, center/edge thickness , optic zone
Most common deposit type?
Proteins
How do protein deposits look like?
White opaque film on surface of lens
How do lipids look like on CLs
Smeared greasy appearance
Often sign of MGD
Can ocur from lotion/makeup
Jelly/calcinate
Occurs in EW CL users White/ clear elevation on top Common inorganic deposit Mixture of calcium, lipid and cholesterol Dispose
Ferrous
Tap water, metal
Inorganic
Throw away!
How often are quarterly contacts replaced?
They are usually sold in packets of?
Every 3 months
Packages of 4
