in this review , based largely on the author 's personal encounter with five large epidemiologic studies ( 2 , 7 , 19 , 30 , 39 ) of the four major chronic eye diseases ( senile cataract , senile macular degeneration , diabetic retinopathy , and glaucoma ) , the following methodological areas are discussed : quality assurance ;
C0015392
eye
C0011884
diabetic retinopathy