Comparing LEA numbers low vision book and Feinbloom visual acuity charts.

Purpose: This study aims to determine the accuracy and repeatability of visual acuity measurements taken with the LEA numbers low vision book (LNLVB) and the Feinbloom chart in visually impaired subjects.

Methods: Distance visual acuities were taken with the LNLVB, the Feinbloom chart, and the Early Treatment of Diabetic Retinopathy Study (ETDRS) chart, then repeated 15 to 30 min later to evaluate for inter-test repeatability. To determine threshold, participants were encouraged to guess until they could not identify any optotypes.