The electroretinographic technique essentially consists in using light to stimulate the retina in a particular set of environmental conditions. Then, a record is kept of the retina response to the luminous stimulus. The following goals were set for the present research: (i) to develop a protocol for electroretinographic exam in healthy green iguanas in order to elicit normal electroretinograms; (ii) to determine which types of photoreceptors exist in the retina; (iii) to assess the influence which the weight and the snout-vent length exert on the electroretinographic parameters. In the literature references consulted, there are few studies on electroretinography in the green iguana. Besides, none of such studies has resorted to any standard and widely accepted protocol for ophthalmologic exam in either human or veterinary medicine. The results obtained in the quantitative analysis were consistent with the simplex, pure cone retina. This suggests that the electroretinographic exam in the green iguana can abide by a protocol based mainly on photopic evaluation.