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Unformatted text preview: Ciliary body: circular muscle, contracts to a smaller circle Do more work to focus near Convex lens converges light Presbyopia: Eye’s ability to focus decreases w/ age Taller ppl need reading glasses later than short ppl, arm length More cells, more rings on crystalline lens, less accommodation Cataract: Can’t see by looking at eye Anything in crystalline lens that’s not perfectly clear Removed by vacuum Makes them presbyope No-line bifocal Gradual change in lens prescription from distance to near Astigmatism: Cornea not spherical 3 #’s: 1 st , distance, 2 nd , astigmatism, 3 rd direction of astigmatism smears vision so you can only read 3 or 4 letters from each line most genetically predictable: autosomal dominant RK how long, how deep, how many can correct nearsightedness, not farsightedness PRK Laser on eye Scrape off epithelial tissue before reshaping Became more hyperopic LASIK Similar to PRK, but cut flap instead Bowman’s layer?...
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This note was uploaded on 09/24/2009 for the course OPTOM c10 taught by Professor Levi during the Spring '08 term at Berkeley.
- Spring '08