ABSTRACT Brightness contrast function was investigated in amblyopic and non‐amblyopic subjects using a baploscopic brightness matching technique. The subjects for the experiment were five amblyopes with central fixation and five control subjects matched for age. The psychophysical method of adjustment was used in brightness matching over a wide range of test and inducing field luminances. All subjects demonstrated brightness contrast functions; however, amblyopic subjects showed abnormal brightness contrast at low and intermediate photopic luminances, but normal contrast function at high luminances. It has been hypothesized that a shift in lateral interactions in the retina, as a result of enlarged retinal receptive fields, contributes to the reduction in visual acuity in amblyopia.
Levi et al. (Sat,) studied this question.