Unequal Corrected Visual Acuity as Related to Anisometropia

It is well known that corrected acuity in ametropia is usually normal, or approximately so, but is sometimes markedly reduced. In many cases this low acuity occurs in eyes which appear normal, even to careful examination. Often the corrected acuity differs markedly in the two eyes; for example, one may be 20/15 and the other 20/40. In some cases unequal acuity is known to be associated with unequal refraction or anisometropia. Anisometropia, it is generally agreed, presents difficult problems of correction. Many writers have speculated regarding the possible relations of corrected acuity to refractive conditions, but satisfacory statistical analyses are lacking. The clinical importance of the problems, particularly in the correction of anisometropia in children, justifies a reexamination of the question with material selected to present those refractive conditions mentioned. The present study is an attempt to apply adequate statistical analysis to appropriate data. SOURCE OF DATA AND TERMINOLOGY The