Visual acuity as measured with Landolt C chart and Early Treatment of Diabetic Retinopathy Study (ETDRS) chart
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Hsi-Kung Kuo & Ming-Tse Kuo & Ing-Soo Tiong & Pei-Chang Wu & Yung-Jen Chen & Chih-Hsin Chen
- چاپ و سال / کشور: 2010
Description
Background We compared the Landolt C chart checked under normal clinical conditions and the Early Treatment of Diabetic Retinopathy Study (ETDRS) chart, using standard clinical research protocols for subjects with normal vision, cataract and maculopathy. Methods This prospective, comparative study was approved by the hospital Institutional Review Board. Patients with cataract and maculopathy were included, with the normal fellow eyes analyzed as normal vision group. Differences between the two charts were analyzed using Studentfs t-test. Results Normal and cataract eyes showed no statistically significant differences between methods. In the maculopathy group, ETDRS acuity (0.714}0.393) was better than Landolt C acuity (0.845}0.579), but the differences were not statistically significant (p=0.152). Furthermore, if after dividing visual acuity into subgroups, >20/200 and.20/200 by Landolt C acuity, the latter subgroup had significant differences between the two tests (p<0.001). ETDRS acuity (1.014}0.319) was better than Landolt C acuity (1.419} 0.385). The average acuity difference was 4 lines. Conclusions For maculopathy patients with VA.20/200, the ETDRS chart had a better score than the Landolt C chart.
Graefes Arch Clin Exp Ophthalmol (2011) 249:601–605 DOI 10.1007/s00417-010-1461-3 Received: 1 April 2010 / Revised: 1 July 2010 / Accepted: 7 July 2010 / Published online: 24 July 2010
