Abstract

Recently the PL or FPL (Tell, Fants et al.) method has been used to measure the acuity of young infants. Although these methods are effective, it is sometimes difficult to apply them to impaired or to multiply-handicapped retarded children, because they are not able to sit straight or to pay attention for any length of time. We have tried to gel the acuity from these children in a modified way or by an improved method. Quite differently from either PL or FPL, we try to get a response from the subjects themselves by using an earlier acquired cognitive task. We used this 2AFC method with some 150 children including 30 normal children, 70 handicapped retarded children, and about 50 with strabismus. We found that it is useful for the measurement of visual acuity of those children with whom it is difficult to use the classical PL or FPL method.

© 1986 Optical Society of America