A schematic eye for the rat

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Abstract

Previously published rat schematic eyes are shown to be inadequate and a new one is developed. It is demonstrated that a homogeneous lens is not satisfactory for modelling a small eye and a core lens model is provided. Attention is paid to the estimation of the confidence limits of the refractive state derived from the schematic eye computations. Other sections deal with peripheral aberrations, posterior nodal distance, exit and entrance pupils and the extent of the uniocular and binocular theoretical and observed visual fields of the rat.

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      Other than for the species of birds that have been cited in the present study, few schematic eyes of adult diapsids have been published, and only a handful of these species also have had measurements taken of their visual fields. Expanding the sample to include mammals (e.g., the eye and visual fields of the rat in Hughes, 1979) and lissamphibians (e.g., the eye and visual fields of a frog in Du Pont & De Groot, 1976) could increase the number of specimens, although any expansion of the sample will require additional CT studies and reaching a sample of nearly 1000 specimens—as suggested for a small effect size—would require more behavioral data for the purposes of comparison. Ultimately, despite several simplifying assumptions and unexpected vagaries discussed in this work, Virtual Ophthalmoscopy is capable of approximating the visual fields of animals that were previously only measured behaviorally.

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