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Ocular dimensions and schematic eyes of freshwater and sea turtles

Published online by Cambridge University Press:  02 June 2009

D. P. M. Northmore  and
A. M. Granda
D. P. M. Northmore
Affiliation:
Neuroscience Program, Department of Psychology, and School for Life Sciences, University of Delaware, Newark
A. M. Granda
Affiliation:
Neuroscience Program, Department of Psychology, and School for Life Sciences, University of Delaware, Newark
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Abstract

Measurements were made of the ocular dimensions from living and frozen eyes of one species of freshwater turtle, Pseudemys scripta elegans, and of three species of marine turtles, Chelonia mydas, Dermochelys cariacea, and Eretmochelys imbricata. Estimates of refractive error by retinoscopy were also obtained with eyes in air and under water. The results suggest that unaccommodated eyes of all four species are approximately emmetropic in air but strongly hyperopic in water. Schematic eyes were calculated for each species in both air and water.

Keywords

TurtleSchematic eyePhysiological optics
Type
Research Articles
Information
Visual Neuroscience , Volume 7 , Issue 6 , December 1991 , pp. 627 - 635
Copyright
Copyright © Cambridge University Press 1991

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