The CSV-1000-1.5CPD is a special test face designed specifically for Food and Drug Administration clinical trials which require the testing of contrast sensitivity at 1.5 cycles/degree under mesopic lighting conditions. The test is also very useful for assessing patients with low vision who require a large angle target for accurate testing.
At the recommended test distance of 8 feet, the gratings test one spatial frequency of 1.5 cycles/degree.