Short sight, long sight and astigmatism : an elementary guide to the refraction of the eye / by George Frederick Helm.

  • Helm, George Frederick, 1838-1898.
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: Short sight, long sight and astigmatism : an elementary guide to the refraction of the eye / by George Frederick Helm. Source: Wellcome Collection.

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