CL Deposits Flashcards
What are some issues associated w/ CL deposits?
Reduce acuity Reduce comfort Reduce wettability Reduce wear time Invoke inflammatory changes
How does the RUDKO grading system work?
Lens removed (in vitro)
Low magnification
Oblique lighting
Classify deposits (visibility, type, coverage)
What is the most common deposit and what is its appearance?
Protein
Thin, translucent appearance
What is the worst protein deposit and why?
Lysozyme - low MW and high +ve charge!
Which group of lenses has mostly lysozyme protein deposits (90%)
GIV (ionic, HWC)
How is protein removed from lenses?
Surfactants, enzyme removers (50-60% removal)
How does lens material affect lysozyme deposits?
More deposits on conventional hydrogel than SiHy
More DENATURED protein on SiHys
Which SiHy has most surface deposits of protein?
PureVision (plasma oxidation coating)
For group IV (Acuvue 2) where are the protein deposits happening?
In the bulk of the lens
small protein w/ opposite charge of lens material
For SiHys, where are the protein deposits happening?
On the front and back surface of the lens
Surface treatment prevents protein from moving into the bulk of the lens
What are lipid deposits? When are they a problem?
Greasy, shiny appearance
Problem for RGPs, GII SCl, SiHys
How do we remove lipid?
Surfactants
What are CALCULI?
Discrete, elevated deposits (90% lipid, 10% calcium)
Round or oval
Anterior surface of SCl only
Grow beneath lens surface
How do you deal w/ Calculi on lenses?
Replacement (removal leaves pits)
What are iron deposits?
Metallic FB embedded
Oxidize to form rust spots
