Human Electroretinogram after Argon Laser Photocoagulation of Different Retinal Areas

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Abstract
Two groups of 10 diabetics were photocoagulated in different ways. In one group the treatment was started in the central area. The other group was initially coagulated in the periphery. ERGs were recorded before, between, and after the separate coagulation sessions. It was found that the ERG was reduced more than expected on the basis of the coagulated area. The fact that the central treatment reduced the ERG more than the peripheral treatment of the equal area indicates that it is the number of destroyed neural elements that is significant. The a-wave was reduced more than the b-wave. This may be explained by the fact that the coagulation lesion is maximal close to the receptor layer.

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