Abstract
Patients with early background diabetic retinopathy and good visual acuity may have normal results on standard methods of measuring color vision. Measurement of individual spectral sensitivity functions shows a moderate decrease in sensitivity of the blue-sensitive receptor system. These results suggest that the blue-sensitive cone mechanism is affected earliest in mild background diabetic retinopathy and that disturbances in its spectral sensitivity function may precede other disturbances of macular function.
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