A manual of diseases of the eye / C. Macnamara.

Date:
[1872]
Catalogue details

Licence: Public Domain Mark

Credit: A manual of diseases of the eye / C. Macnamara. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    observer views the fundus of the eye througli the meri- dian of tlie greatest or least curvature. ^ , , , i ^, I£ a person whose eye is healthy, be directed to look c ^romat.c through a plate of violet-coloured glass, fixed m a black • Fig. 52. screen, the glass will appear to be surrounded with a red rim ; this is accounted for by the different refran- gibility of the rays of light. In the case of astigmatics, the refraction seems to be completely altered.: for if the