Glasgow acuity cards(redirected from log MAR crowded test)
Glasgow acuity cards
A visual acuity test composed of a set of cards contained in a flip card format. There are four letters on each card subtending the same visual angle, and of equal legibility. The progression of letter sizes from one card to the next is linear using a logarithmic scale, and the four letters are surrounded by a rectangle providing horizontal and vertical contour interaction. The test is performed at 3 m and is designed for children from three years of age and is particularly adapted for the management of amblyopia. Syn. log MAR crowded test.