Ophthalmic surgery and treatment : with advice on the use and abuse of spectacles / by John Phillips.

  • Phillips, John.
Date:
1869
Catalogue details

Licence: Public Domain Mark

Credit: Ophthalmic surgery and treatment : with advice on the use and abuse of spectacles / by John Phillips. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    510/538 (page 494)
    (Fag. 51. EXAMINATION WITH THE OPHTHALMOSCOPE. (=O.S.) The instruments necessary for the examination are: an oph- thalmoscope and a spherical lens. The ophthalmoscope consists—(a.) Of a slightly concave, circu- lar mirror, of a focal length of from 12 to 15 inches. The mirror should have a diameter of about 2 inches, and be mounted in a light frame of tortoise-shell, horn, or gutta-percha, with a broad rim, to admit of its being held securely, (b.) A circular portion (a.) Among the great variety of ophthalmoscopes must be mentioned: the Binocular Ophthalmoscope, the Anto-Ophthalmoscope, for examination of one's own eyes, the Ophthalmoscope with micrometer, etc., fixed on a stand, and the Ophthalmoscope for viewing the image reflected from the interior of the eye in a second reflecting surface. Any good light-reflecting surface may be used as an ophthalmoscope, as long as the observer is placed in a position to receive the light returning through the pupil of the examined eye into his own. The ophthalmoscope de- scribe! above answers all practical purposes. (6.) More light is gained by not having a hole bored through the glass, to