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Early Reflecting Ophthalmoscope

Early Reflecting Ophthalmoscope. Digre , Corbett.

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Early Reflecting Ophthalmoscope

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  1. Early Reflecting Ophthalmoscope Digre, Corbett

  2. Early on, all of the ophthalmoscopes were "reflecting"--just like Helmholtz's original. Reflecting means that they used an external light source such as a candle, sunlight, or a lamp. Quickly after Helmholtz' initial report, many inventors made improvements over the next 50-60 years. Here you see early reflecting ophthalmoscopes using a disc of different lenses so that changing concave lenses would not be necessary. This disc known as the Rekoss disk had many variations over the next decades. (B) Photograph courtesy ofMayo Historical Unit Foundation, Rochester, Minnesota (A) Photograph courtesy ofMayo Historical Unit Foundation

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