Abstract
Using the electroretinogram as the criterion of retinal activity, dark-adaptation, CFF, suppression, and hypothermia were investigated in the Iguana iguana and Gekko gekko. The ERGs of both species display properties of a simplex type of retinal organization, with that of the iguana being consistent with a pure cone retina and that of the gecko consistent with a pure rod retina. The degree of suppression was significantly greater in the gecko than the iguana. During hypothermia there was a progressive decrease in the size of all components of the ERG, but all components were present even at 5°.
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