label: Abnormal Esterman grid perimetry test
label_lc: abnormal esterman grid perimetry test
description: "The Esterman grid test assays scores visual acuity. The grid consists of 100 units whose unequal size and distribution reflect the unequal functional value of different parts of the field-in effect a weighted or relative-value scale. Because each unit equals 1 percent, a simple count of units yields the functional score in percent."