Abstract
To evaluate central optic pathways' involvement in diabetics, visual evoked potentials (VEP), in particular the latency of positive peak (LP100), were studied in 35 patients without retinopathy (4 insulin-dependent, 31 non-insulin-dependent) and 35 normal controls using reversal pattern stimulation. LP100 was significantly delayed in diabetics at both binocular and monocular stimulation. Furthermore, the delay in LP100 was significantly longer in the diabetics with polyneuropathy than in those without, particularly after binocular stimulation. A positive correlation was found between latencies of VEP and HbA1, duration of disease, and neurologic score. VEP measurement seems a simple and sensitive method for detecting early alterations in central optic pathways in diabetics.
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