Abstract
Electroretinograms (ERG) were recorded using contact lens electrode and periorbital skin electrode in the opened- and closed-eye states in 15 volunteers. The implicit times of a-wave and b-wave were almost equal between recordings by contact lens electrode and those by skin electrode, when the tested eye was opened. Implicit times were prolonged when tested in the closed-eye state. In the opened-eye state, the b-wave amplitude by skin electrode was decreased to an extent of about 40%, compared to that by contact lens electrode. If repetitional stimuli of higher intensities were employed and responses were averaged, clinically satisfactory ERGs were recordable with skin electrodes in the closed-eye state.
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