1966221 ETDRS Early Treatment Diabetic Retinopathy Study 1355 1966223 ETDRS Early Diabetic Retinopathy Study 5 1966224 ETDRS Early Treatment DR Study 3 1966220 ETDRS early diabetic retinopathy treatment studies 1 1966219 ETDRS Early Treatment Diabetic Study 1 1966225 ETDRS efficacy of treatment was analyzed by visual acuity assessment 1 1966222 ETDRS ETDRS seven-standard-field 35-mm stereoscopic color retinal imaging 1 1966226 ETDRS evaluated using standardized visual acuity charts 1 1966227 ETDRS examination was performed, documenting visual acuity 1 1966228 ETDRS examination with determination of distant visual acuity 1 1966229 ETDRS eyes with best corrected 1 1966230 ETDRS response to dexamethasone, with an increase in visual acuity 1