Our eyes, and how to take care of them / by Henry W. Williams.

  • Williams, Henry W. (Henry Willard), 1821-1895.
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: Our eyes, and how to take care of them / by Henry W. Williams. 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.

    23/114 (page 19)
    tive bulging of the sclera is seen at this point. During life, we can observe these changes, and watch their progress, by means of the ophthalmoscope. This instrument, by which we are enabled to illuminate and explore the interior of the eye, has thrown new light upon the whole subject of near- sightedness. By its aid we are able to follow the morbid changes as they are successively developed. We can distinctly observe the progressive giving way of the retina, optic nerve, choroid, and sclera, to form the bulging which is termed posterior staphyloma; can notice the congestion and other changes fol- lowing imprudence; and, too often, can see the advent of separation of the retina from, the choroid, with its accompanying loss of sight. As the retina expands with the general enlargement, the nerve tissue, in that layer of the retina which is the seat of its especial function, is, of course, extended over a larger surface, and its perceptive power proportion-