The Cure of Imperfect Sight by Treatment
Without Glasses - online book

The Original Bates Method, for correcting vision defects

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224 Squint and Amblyopia: Their Cause
have hypermetropia; but many others have not. Some persons with convergent squint have myopia. A person may also have convergent squint with one eye normal and one hypermetropic or myopic, or with one eye blind. Usually the vision of the eye that turns in is less than that of the eye which is straight; yet there are cases in which the eye with the poorer vision is straight and the eye with the better vision turned in. With two blind eyes, both eyes may be straight, or one may turn in. With one good eye and one blind eye, both eyes may be straight. The blinder the eye, as a rule, the more marked the squint; but exceptions are frequent, and in rare cases an eye with nearly normal vision may turn in persist ently. A squint may disappear and return again, while convergent squint will change into divergent squint and back again. With the same error of refraction, one per son will have squint and the other not. A third will squint with a different eye. A fourth will squint first with one eye and then with the other. In a fifth the amount of the squint will vary. One will get well with out glasses, or other treatment, and another with these things. These cures may be temporary, or permanent, and the relapses may occur either with or without glasses.
However slight the error of refraction, the vision of many squinting eyes is inferior to that of the straight eye, and for this condition, usually, no apparent or suffi cient cause can be found in the constitution of the eye. There is a difference of opinion as to whether this curious defect of vision is the result of the squint, or the squint the result of the defect of vision; but the predominating opinion that it is, at least, aggravated by the squint has been crystallized in the name given to the condition, namely, "amblyopia ex anopsia," literally "dim-sighted-