The first successful eccentric correction

Abstract

This paper presents a new procedure for assessing off-axis refractive errors; in this case, oblique astigmatism. By using photorefraction to objectively measure the off-axis refraction, it is possible to identify and provide eccentric correction that results in better image quality for the preferred retinal location (PRL) or the trained retinal location (TRL). This paper describes the case of a 56-year-old man who has suffered from a large central visual field loss (CFL) for more than 30 years. He is the first case to show an improvement of visual function in the peripheral portion he uses outside the macula when eccentric correction is used. A ring target test from ring perimetry (HRP) was used to assess the residual vision. Contrast sensitivity function was also evaluated. The results correlated with the subjective improvement reported by the low vision person. More cases need to be evaluated and new technology developed in order to improve optical and visual assessment.