title: Macular edema reduces B cone sensitivity in diabetics.
abstract: A simple clinical test of B cone pathway sensitivity shows that a group of 45 diabetics (of which 31 have VA >/= 20/20) are 40 times less sensitive than a group of 57 normals. By contrast, the diabetic group is less than 2.2 times less sensitive than the normals for R and/or G cone pathway sensitivity. The selective B cone sensitivity loss is seen even in patients who have no macular edema; however, the presence of edema is associated with significantly greater sensitivity loss. Age differences between the groups cannot account for the differences seen between normals and diabetics.
authors.forename: A J
authors.initials: AJ
authors.lastname: Adams
authors.forename: F
authors.initials: F
authors.lastname: Zisman
authors.forename: E
authors.initials: E
authors.lastname: Ai
authors.forename: G
authors.initials: G
authors.lastname: Bresnick