Spatial summation properties for magnocellular and parvocellular pathways in glaucoma

Abstract

PURPOSE. To examine the spatial summation properties for the magnocellular (M) and parvocellular (P) visual pathways in participants with glaucoma and approximately age-matched controls in central and midperipheral retinal eccentricities. METHODS. Contrast discrimination thresholds were measured for six different stimulus array sizes, using steady- and pulsedpedestal paradigms designed to measure function of the M and P pathways, respectively. This study involved 15 participants with glaucoma and 17 approximately age-matched controls. All participants completed trials foveally and at 12.5° eccentricity. The peripheral stimulus location for each glaucoma participant was within a quadrant of e..