. Author manuscript; available in PMC: 2020 Aug 6.

Published in final edited form as: Ophthalmic Surg Lasers Imaging Retina. 2020 May 1;51(5):262–270. doi: 10.3928/23258160-20200501-03

TABLE 1.

Visual Acuity and Contrast Sensitivity Measurements

Near VA
ETDRS letters, mean ± SD	Better eye	53 ± 17
ETDRS letters, mean ± SD	Worse eye	41 ± 17
Number of patients, %	< 20/40	57 (73%)
Number of patients, %	≤ 20/200	23 (29%)
Contrast Sensitivity
LogCS, mean ± SD	Better eye	1.1 ± 0.4
LogCS, mean ± SD	Worse eye	0.7 ± 0.5
Number of patients, %	< 1.5	62 (79%)
Number of patients, %	< 0.9	24 (31%)

ETDRS letters were presented to the patients using forced multiple-choice, single-letter discriminations at 14 inches. Mean number of letters identified in the better and worse eye and standard deviation were reported and converted to equivalent Snellen scores. A 5-letter difference was equivalent to one Snellen line.

VA = visual acuity; ETDRS = Early Treatment Diabetic Retinopathy Study; SD = standard deviation