By Gerald H. Jacobs

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OCULAR FILTERS 39 density values are greatly different for these three species. For example, cone density is over twenty times as great in the center of the retina in man as compared to the nocturnal owl monkey. //. Ocular Filters To be effective as a stimulus for vision, light must reach the photoreceptor outer segments and be absorbed by the photopigments contained therein. As much as 50% of the light passing through the ocular media does not contribute to vision because it is absorbed, reflected, or scattered before it reaches the retina.

In one of these zones the component cells in the postsynaptic triad are identified (H, horizontal cell; B, bipolar cell). Magnification: x 22,500. (Photomicrograph courtesy of S. K. ) unambiguous for all photoreceptors, nor do they necessarily always agree with one another. Nevertheless, form can be used to categorize most photoreceptors as rods or cones. In cases where this categorization is not possible on structural criteria alone, certain functional properties of these cells may be used as adjunctive indices.

SOME BASIC DATA ON HUMAN COLOR VISION 31 16 - \ \\ \ \ 12 \ \ \ \ I0 - 14 < \\ 8- / / / / [ / \\ / \ 7 6 4 ' , . 16 Wavelength discrimination for human deuteranopes (—) and protanopes (--). ) slightly displaced from this location, discrimination falls off drastically. 16), and they are quite similar for the two types of dichromacy—enough so that these measurements cannot be used to differentiate the two types of dichromacy. 3. Monochromacy Monochromats lack color vision. They are able to match the appearance of two lights by simply adjusting the intensity of one of them.

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