Altered visual sensitivity in axial high myopia: A local postreceptoral phenomenon?

Abstract

PURPOSE. The present study investigated retinal integrity in high myopia using spatial psychophysical tasks. METHODS. Ten axial high myopes (-8.5 to -11.5 D) and 10 age-matched control subjects (±1.0 D) were recruited. All participants underwent clinical examination and ocular biometry and demonstrated no visible macular disease with visual acuities better than 6/12. Foveal summation thresholds were determined for white and S-cone-isolating spots of various diameters up to 5.4° and spatial contrast sensitivity to luminance sine wave gratings (0.5-9.7 cyc/deg). Data were analyzed after correction for the magnification induced by eye size and correcting lens power. RESULTS. Spatial summation f..