A number of physiologic factors which affect the electroretinogram (ERG) have been reported, including hypoxia,1,13 glucose deprivation,1 reduced retinal blood supply,7,9 increase in intraocular pressure,6,9,10 retinal edema,7,8 and toxic effects of drugs.2,11,13,14 Many clinical conditions such as various retinopathies, glaucoma, papilledema, and optic neuritis appear to affect the ERG as a result of circulatory changes, often associated with sclerotic processes (see also reviews by Crescitelli5 and Henkes8).While there is general agreement that the ERG appears to originate somewhere within the retina, there is far from a perfect correlation between ERG potentials and visual functioning, normal vision persisting in the presence of abnormal ERG's, and normal ERG's being found in cases of seriously impaired vision. In this regard it is of interest to note that Tepas and Armington15 report that "At low luminance levels, where a summed electroretinogram could no
WOLIN LR, MASSOPUST LC, MEDER J. Electroretinogram and Cortical Evoked Potentials Under Hypothermia. Arch Ophthalmol. 1964;72(4):521–524. doi:10.1001/archopht.1964.00970020521016
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