contrast sensitivity at low to intermediate frequencies is in cataract Pxs surgery can return these values to age-matched normal values the best available test for use is the Pelli-Robson chart Pxs with contrast sensitivity 1.35 are likely to complain of poor vision Contrast sensitivity (CS)
Mrs. D.H.: Homemaker, age 68 years, with extensive cortical cataract R & L and Sxs of great difficulty recognising friends, reading and knitting, with much worse vision in bright sunlight.
VAs: R: 6/6, L: 6/7.5. Reduced Pelli-Robson CS (1.05 and 1.35 log) provided justification for surgery. The right cataract was extracted (the eye with the better VA but the worst CS) and this provided significant improvement in visual ability.