Repeatability of an automated ETDRS contrast threshold measurement.

This technical report presents the repeatability of an automated Early Treatment Diabetic Retinopathy Study (ETDRS) contrast threshold (ETDRS-CT) test in participants (N = 40) with normal vision as well as in subjects with reduced visual acuity. The automated ETDRS-CT test showed good test-retest repeatability between the two administrations in both normal and reduced vision participants. Measurement at the retest yielded 0.05 log higher contrast sensitivity than at the first measurement, which might be due to a learning effect among participants.