The Ophthalmoscope

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R. Hardwicke, 1864 - 225 pages
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Page 142 - ... from the size of a lentil to that of a pea, and also by the white flecks already described.
Page 73 - Liebreich for the inverted image, in spite of abundant light and perfect definition, the details of the picture appear to be all in the same plane. The vessels of the retina can be distinguished from those of the choroid by colour and direction, but not by any appreciable difference in their position. The depressions formed by choroidal atrophy or posterior staphyloma, and the elevations from sub-retinal haemorrhage or effusion, present colours which contrast with those of the general field, but...
Page 10 - The problem was threefold : the observed eye must be sufficiently illuminated ; the eye of the observer must be placed in the direction of the emerging rays ; and these must themselves be changed from their convergence, and rendered divergent or parallel.

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