Prevention of blindness due to senile disciform macular degeneration.
D000375:Aging; D001766:Blindness / Q000209:etiology / Q000517:prevention & control*; D005069:Evaluation Studies as Topic; D006801:Humans; D008028:Light Coagulation; D008268:Macular Degeneration / Q000150:complications* / Q000601:surgery; D012306:Risk; D013997:Time Factors