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.

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    vision. It has, furthermore, a strong disposi- tion to hereditary descent, re-appearing in the children or grandchildren of myopes. The defect in form, in short-sighted eyes, does not consist, as was formerly supposed, in an undue prominence of the front part of the eye, but in an elongation of the whole globe from before backwards; so that it assumes an olive or egg shape, instead of being round. This lengthening mostly occurs at the back part of the eyeball, and is not to be observed at first sight; but, in many cases, we may see that the eye has this altered form, and extends back farther than usual in the socket, by drawing the lids apart at the side next the temple, the eye being at the same time turned towards the nose. All the coats of the eye are implicated in these changes, which take place, sometimes by gradual expansion at every point, but usually by a more considerable giving way around the entrance of the optic nerve. In examination of such eyes after death, a posi-