The American journal of the medical sciences (1827)
[Thorofare, N.J., etc.] Charles B. Slack [etc.] · leaf 327
ing thus ascertained, in a general way, the nature of the optical con- dition present, the next step is to determine the exact degree of the refrac- tion. The method for doing this will be embodied, for the sake of convenience and brevity, in the following propositions, it being presupposed in all… … ophthalmoscopic mirror m. Since the eye is emmetropic, and in a state of rest, rays radiating from an illuminated point a on the retina must leave
Medicine
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