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Many persons have considerable difference in the size and conformation of the eyes. The external measurements of one eye may differ from those of the other. One eye only may be perfect. Both eyes may be imperfectly formed, the imperfection of one eye differing in degree or in nature from that of its fellow. The combinations met with are numerous and varied. Occasionally one eye sees distinctly only distant objects, while the other is of service only for near vision. Often one eye is used for both near and distant vision, the other eye being used but little or not at all. A considerable difference sometimes exists until late in life without affecting the vision or comfort. On the other hand, slight differences frequently cause strabismus, amblyopia and asthenopia early in life.
The above condition is called ''anisometropia.'' The reasons advanced for the frequent failures to correct it with lenses
JENKINS NB. DISSIMILAR EYES. JAMA. 1899;XXXII(7):351–352. doi:10.1001/jama.1899.92450340018002e
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