Refraction of the eye : its diagnosis and the correction of its errors with a chapter on keratoscopy / by A. Stanford Morton.

  • Morton, A. Stanford.
Date:
1882
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Licence: Public Domain Mark

Credit: Refraction of the eye : its diagnosis and the correction of its errors with a chapter on keratoscopy / by A. Stanford Morton. Source: Wellcome Collection.

    72/76 (page 60)
    may be found in old standing- cases of strabismus or in diseased eyes. Others again, without any error of refrac- tion, may have defective vision owing- to disease; with have been intended merely to indicate the various modes of estimating and correcting errors of refraction; the reason why, after such correction, the vision is not improved must be ascertained by other means. Some patients, in whom we cannot find either disease or error of refraction, may simulate total or partial blindness. The latter may often be detected by holding in front of their eyes different pairs of convex, neutralised by their corresponding concave lenses. With these, thinking they are being aided, such patients may frequently be persuaded to read perfectly. Another method of detecting simulation, especially of one eye, is to hold in front of the blind (?) eye, a prism with its base out or in, when if there be an attempt (seen by movement of the eye) to fuse the double images, it proves sight present in the eye in question. If some such order of procedure, as indicated in these pages, were adopted, one would not, as is now frequently the case, see a beginner fall into the error of supposing a patient myopic because he can read f (fg) as well with, as without, a concave lens; or that hypermetropia is present because the patient can read Sn. i with convex glasses. Some of the statements may have appeared somewhat too general but it has been thought advisable not to confuse the beginner by enumerating all the possible^ and minor exceptions to the general rules. X-TTo^ such, however, we have not here to deal. These pages LIBRARY