Copy 1

The economy of the eyes: : Precepts for the improvement and preservation of the sight. Plain rules which will enable all to judge exactly when, and what spectacles are best calculated for their eyes Observations on opera glasses and theatres, and an account of the pancratic magnifier, for double stars, and day telescopes. / By William Kitchiner, M.D.

  • Kitchiner, William, 1775?-1827.
Date:
1824
Catalogue details

Licence: Public Domain Mark

Credit: The economy of the eyes: : Precepts for the improvement and preservation of the sight. Plain rules which will enable all to judge exactly when, and what spectacles are best calculated for their eyes Observations on opera glasses and theatres, and an account of the pancratic magnifier, for double stars, and day telescopes. / By William Kitchiner, M.D. Source: Wellcome Collection.

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    ence :—and I believe it is as good a General Rule as can be written; but, as I have ob- to enable those who have undergone the operation of Couching, to see objects at different distances — who ge- nerally require one pair of Spectacles for near, and another for distant, objects. The ,foci which are used lie between -6 and 1§ inches.” —~G. Apams on Vision, 8vo. 1792, p. 126. If you are a Laughing Philosopher, gentle Reader, You will not be very angry with the Author for inserting the following Anecdote : — “In the city of Leyden, in Holland, a young woman lost her sight from a cataract; the operation of couching was successfully performed upon her Eyes, and she reco- vered the use of them; but it appeared that the Visual Organ (as is usual in such cases) was not completely re- stored to its primitive condition. Some very singular and unaccountable anomalies in her Vision presented them- selves, which not a little puzzled the curious in Physiology and Optics. ‘Tt was ascertained that her Eye was able to define a certain class of very minute objects with abundant accu- racy, such as the Eye of a needle, for example, which she could thread as well as ever; but on presenting her with a Book, it was evident that she could not distinguish a single letter, but complained that she could see nothing but a heap of odd marks. “‘ These facts, no less strange than true, naturally excited an intense interest among the Medical Professors and Students; every one was anxious to distinguish himself by