A comparison of total and manifest hypermetropia, as determined by the the prisoptometer, with and without the use of mydriatics / by H. Culbertson.

  • Culbertson, H. (Howard), 1828-1890.
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: A comparison of total and manifest hypermetropia, as determined by the the prisoptometer, with and without the use of mydriatics / by H. Culbertson. 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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    A COMPARISON OF TOTAL AND MANIFEST HYPEKMETROPIA. AS DETERMINED BY THE PRISOPTOMETER, WITH AND WITHOUT THE USE OF MYDKIATICS. The proptometer is an instrument invented by the writer to determine ametropia, through the aid of a prism of glass. A description of it may be found in the Cincin- nati Lancet and Clinic, January 20, 1883, and in the Journal of the American Medical Association, January 5, 1884. It should be stated that its results are accurate, and that its application is simple. The object of this paper is to decide, first, what is the degree of manifest hyperopia as shown by the instrument without the aid of mydriatics, and, secondly, to determine by it the total hyperopia after the use of agents which para- lyze the ciliary muscle. °° It should be stated that the scale of the prisoptometer is represented as follows. It runs from the vertical 0° to 90° on either side, and to the horizontal line. By reference to the table it will be seen that hypcropic astigmatism, as well as the spherical hyperopia, has been included in the calculations. The accompanying table gives a statement of the cases. 80