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It is a common observation that the deviated eye in ordinary (non-alternating) strabismus presents often a very low degree of sight, without structural changes to account for it. Two explanations of this condition have been suggested, but it has not yet been possible to decide which is the correct one. On the one hand it is claimed that the deviating eye loses its visual acuity by non-use. Whenever doublesight occurs in consequence of want of agreement in the direction of the two visual axes, there is a tendency to the suppression of one or the other of the retinal images. If one of the images is less sharp than the other, on account of a less correct state of refraction of that eye, it is the weaker image which is more easily suppressed. Indeed, in strabismus it is mostly (though not always), the more ametropic eye which deviates. But even
IS THERE AN AMBLYOPIA EXANOPSIA?. JAMA. 1893;XXI(24):899–900. doi:10.1001/jama.1893.02420760029008