Abstract
Adult Western Fence Lizards maintained for a year on a vitamin A-free diet showed marked degeneration of the cones in the lateral eyes and of the receptors in the parietal (third) eye. Electron microscopy reveals that the disks of the outer segments of both types of receptors break up into vesicles. Many parts of the photoreceptors show no observable change as a result of the vitamin A deficiency. Further study is needed to determine whether other structures in the third eye are affected, such as the paraboloid-like body and the whorls in large nerve fibers.
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