CHEM 3B Lecture Notes - Lecture 3: Orinda, California, Twin, Emmetropia
Document Summary
Point sources of light diverge when travels a distance (~ 20ft) Bend light to make things more focused. When looking at someone, the macula directs there. Acute onset (one day it just came out of focus) vs gradual onset (happening for 2 weeks) 20/20 -> test distance (in feet)/letter size. Letter must be twice as big to see. Insufficient monitoring of growth of the eye, grows but doesn"t stop b. c signal broke. Fraternal -> born same time, different dna (same as regular siblings) If baby emmetropic, may be nearsighted in future. Text-messaging, handheld video games, surfing the web. Sports: 0. 917x as likely (sunlight?) not a good measurement b/c didn"t ask if sport was outside or inside. Eye focuses light in back of retina. Eye"s ability to focus decreases w/ age. By age 40, near point of focus is arm"s length. Another layer of cells is added every year, flexibility of lens decreases. Cornea more like a football rather than spherical.
