Contrast sensitivity basics and a critique of currently available tests

The ability to distinguish contrast plays an important role in patients' everyday vision. Contrast sensitivity testing can identify many ocular diseases. Testing the peak of contrast sensitivity function provides a useful clinical adjunct to standard visual acuity assessments. This article reviews the basics of contrast sensitivity. It also describes the currently available contrast sensitivity tests and compares their reliability, advantages, and disadvantages. (C) 2013 ASCRS and ESCRS