Strabismus : its treatment / by A. Edward Davis.

  • Davis, Achilles Edward, 1866-1941.
Date:
[1901]
Catalogue details

Licence: In copyright

Credit: Strabismus : its treatment / by A. Edward Davis. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    This gives a stimulus to use the eyes together. 2. The glasses, by taking the strain off of the ciliary muscle^ lessen convergence in exactly the same way as mydriatics do by relaxing the accommodation. Many cases of con- vergent strabismus are relieved by the use of atropin ana glasses alone if taken early. And, if the exclusion pad is used in addition, it greatly increases the chances of recovery without operation. Usually in fitting glasses I do not use a mydriatic of any kind, but in strabismus cases I always use a mydri- atic; because it helps directly to improve the squint and at the same time allows almost full correction to be given the patient to wear; not only this, but as most of these cases are under 6 years of age and can not be tested subjectively, that is, by the trial case and test card, it makes the objective test easier and more accurat-e. When divergent strabismus is present in hyperme- tropic eyes, no glasses should be worn except to -correct any astigmatism that may be present, because by re- laxing the accommodation they increase the divergence. In myopia and myopic astigmatism the refractive error should be corrected fully, for the minus glasses stimulate the accommodative act. and in this way increase con- vergence and help overcome the divergence, especially in low degrees of divergence. 4. Bar-Reading.—In patients who are old enough, bar-reading is a useful adjunct in making the patient use the eyes together. It consists simply in holding a pencil or some other small object vertically before the eyes, and in front of a page of printed matter which the patient is reading. If the patient is not using the eyes together, but only the good one, when the line of vision in the good eye comes to the pencil the patient will stop reading or skip a word, or part of it, whereas, if the eyes are being used together, no such stop will take place, or missing any letter or part of a word. By persistent practice with this method the patient is often brought to use the eyes together, with effort at first but with facility after practice. 5. Stereoscope.—The stereoscope can not be used till the patient is 5 or 6 years of age. Its use gives the greatest stimulus to single binocular vision, that is, true form perception. By using special pictures, especially