Abstract
The atypical morphology and physiology of the snake eye is commonly attributed to a subterranean evolutionary period. It is suggested that many characteristics of this eye are due to the optical effects of the spectacle. Study of the gross morphology of the optical media of three species was undertaken by means of a rapid freezing and sectioning method. Refractive indices were measured. The refractive contribution of the spectacle is significant and almost equal to that of the lens. However, the spherical shape of the lens and its relatively high refractive index indicate an enhanced refractive function for this structure. Study of more primitive species is required.
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