1.Previous
3.Next

to discern different luminances in a static image. It varies with age, increasing to a maximum around 20 years at spatial frequencies of about 2-5 cpd; aging then progressively attenuates contrast sensitivity beyond this peak. Factors such as cataracts and diabetic retinopathy also reduce contrast sensitivity. In the sweep grating figure below, at an ordinary viewing distance, the bars

1.Previous
3.Next