How to take care of our eyes : with advice to parents and teachers in regard to the management of the eyes of children / by Henry C. Angell.

  • Henry Clay Angell
Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: How to take care of our eyes : with advice to parents and teachers in regard to the management of the eyes of children / by Henry C. Angell. 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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    raphy and the nature of the process that goes on in The retina is tne act °f seeing. Rabbits have been rtceivefthVhn' held a few seconds before a window, pression. and the]lj being imme(iiately killed, the picture of the window has been found distinctly photographed on the retina of their eyes. After the reception of the image upon the retina, the act of The optic nerve seeing is completed by the transmission SptS of the impression to the brain through to the brain. the optic nerye (Q N in the figure) But in order that the image of an object on the Rays of light retina shall be clear and distinct, it is must be fo- cused necessary that the rays of light passing Fig. B. A, the rays of light entering the eye. R, the retina, where they should be focused. L, the lens by which the rays of light are chiefly focused. into the eye through the pupil should be properly focused. See Figure B. above.