Defects of sight and hearing : their nature, causes, prevention, and general management / by T. Wharton Jones.

  • Jones, Thomas Wharton, 1808-1891.
Date:
1859
Catalogue details

Licence: Public Domain Mark

Credit: Defects of sight and hearing : their nature, causes, prevention, and general management / by T. Wharton Jones. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

    51/260
    Different kinds of cataract are recognized by surgeons, and the distinction of one from the other is a point of no small importance, for on it depends a correct conception of the rise and progress of the disease, and, especially, the discrimination of the operative procedure best adapted to effect a restoration of sight in a given case. Cataract, as above denned, is sometimes distinguished by the epithet true, into contradistinction to what has been called false cataract, which consists in opaque deposits of lymph, matter, blood, &c, on the crystalline body, ob- structing the pupil—the consequence commonly of anterior internal inflammation of the eye neglected or mistreated. False cataract, however, may be combined with certain kinds of true cataract. Relative frequency of Cataract at different periods of life.— From 1 to 10 years « 11 20 » 21 30 « 31 40 « 41 50 '< 51 60 « 61 70 71 and upwards 14 16 18 18 51 102 172 109 500 Lenticular cataract or opacity of the proper substance of the crystalline lens constitutes the typical example of cata- ract; and whilst it is the most common kind, it is fortu- nately that which admits of the most ready and perfect cure In older persons, the opaque lens is hard; in younger persons, soft.