Do the Pelli-Robson and Test Chart 2000 Xpert demonstrate comparable contrast sensitivity results?

Abstract

Aim: To establish whether the contrast sensitivity threshold obtained with the computerised Test Chart 2000 Xpert is comparable with the printed Pelli-Robson chart. Methods: Healthy volunteers from a student population were recruited. The inclusion criteria included: monocular visual acuity of at least 0.2 logMAR, no history of any ocular abnormalities and amblyopia, no sign of any manifest strabismus and a Frisby stereo-acuity threshold of at least 85 seconds of arc. Visual acuity was assessed at 1 m to allow the contrast sensitivity to be directly comparable. The results were statistically analysed using a two-factor ANOVA and a paired t-test. Results: Twenty participants (7 male, 13 female) were recruited with a mean age of 20.9 Ô 6.0 years. The average visual acuity tested at 1 m was À0.05 Ô 0.