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Excerpt from The Optical Defects of the Eye, and Their Consequences, Asthenopia and Strabismus (Classic Reprint)
In the course as actually delivered by me at the Ophthalmic Hospital, Southwark, all the leading phenomena of optical science, as the laws of reflection and refraction, &c., were fully discussed but as these subjects are but imperfectly intelligible without such experimental illustrations as I then produced, I have omitted them in the lectures as now published, proceeding at once to the consideration of optical lenses, a knowledge of which is.
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