THE ASSOCIATION of amblyopia ex anopsia with strabismus or anisometropia is well known. That type of amblyopia constitutes no part of the considerations in the present paper. There is, however, a type of amblyopia which is unassociated with present or past strabismus or with anisometropia. In 1944 I1 had the opportunity to study a number of soldiers with the latter type of defective vision. For want of a better name, the term "unexplained amblyopia" was applied to this condition. The redundancy in such a name is obvious, for by definition amblyopia is "poor vision which cannot be explained on any organic basis"; but the term was used only in an effort to emphasize the distinction between this type of amblyopia and the much commoner form, amblyopia ex anopsia.
The study in 1944 included 42 consecutive cases, representing 0.45 per cent of about 9,300 new patients referred to a large
HALLETT JW. AMBLYOPIA INDEPENDENT OF USUAL ASSOCIATED CONDITIONS. AMA Arch Ophthalmol. 1951;45(1):64-69. doi:10.1001/archopht.1951.01700010067008