On an improved optometer for estimating the degree of astigmatism and other errors of refraction / by John Tweedy.
- Tweedy, John, 1849-1924.
- Date:
- [1886]
Licence: Public Domain Mark
Credit: On an improved optometer for estimating the degree of astigmatism and other errors of refraction / by John Tweedy. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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