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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    brought to a focus at the proper point for distinct perception. It is, therefore, irra- tional and useless to attempt a substitution of other means, instead of resorting to these glasses, which, by rendering parallel rays di- vergent, adapt them for the excessive refrac- tion of the myopic eye, thus relieving an infirmity which is not to be removed. The use of glasses for distant vision is often objected to by parents and friends, from an idea that the short-sightedness will thus be increased, or in the expectation that the eyes will become of normal power at a later period if glasses are not worn. Both of these opin- ions are erroneous. Myopic eyes are not injured by wearing suitable glasses; but, on the contrary, are often preserved from injuri- ous pressure on the globe in the indulgence of the habit of nearly closing the lids in order to obtain a clearer impression of the images of distant objects, as is commonly done when glasses are not worn. Nor will the myopia be appreciably lessened by abstinence from