Measuring Contrast Sensitivity Using the M&S Smart System II versus the Pelli-Robson Chart
Contrast sensitivity (CS) refers to the ability of the visual system to detect differences in luminance (i.e., brightness) between an object and its background. Assessment of CS provides valuable information in the early detection and monitoring of ocular diseases, as well as evaluating the impact of therapy. The most widely used clinical spatial CS test is the Pelli-Robson chart (Clement Clarke International, Essex, UK). Several factors may influence the CS threshold measured. First, although the recommended luminance is 85 candelas/m2 (range, 60–120), maintaining consistent luminance across the entire chart can (Read more...)