Vision

Cover Vision
Vision
H P Henry Pickering Bowditch
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3.
2 Kiihne: Unlersuchungen a. D. Phys. InsL d. Universitdt Heidelberg, i. 1.
THE SENSE OF VISION. 777 as it contains no rods, is destitute of visual purple, makes it impossible to regard this coloring matter as essential to vision. The most probable theory of its function is perhaps that which connects it with the adaptation of the eye to varying amounts of light, as described on p. 772.
In addition to the above-mentioned movements of the pigment epithelium cells under the influence of light,
...certain changes in the retinal cones of frogs and fishes have been observed. 1 The change consists in a shortening and thick- ening of the inner portion of the cones when illuminated, but the relation of the phenomenon to vision has not been explained.
Like most of the living tissues of the body, the retina is the seat of electri- cal currents. In repose the fibres of the optic nerve are said to be positive in relation to the layer of rods and cones. When light falls upon the retina this current is at first increased and then diminished in intensity.


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