Two smaller groups 6M to 1.5M for repetitive testing (20/40, 6/12 to 20/10, 6/3 equiv.).
CAT.NO. 914 Small Illuminator Cabinet is necessary with these low contrast charts.
Even though a patient has normal acuity vision, does not mean that their contrast sensitivity is also normal. Contrast sensitivity is a vital part in normal vision and should be tested on a routine basis. Without normal contrast sensitivity, the difference between a curb and the road, stairs, a spot on clothing and many other everyday items would be unnoticeable.