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A Journal on Ophthalmology
Minerva Oftalmologica 2013 December;55(4):79-85
Involvement of the visual evoked potentials in type 2 diabetes
Morreale Bubella D., Morreale Bubella R.
Eye Institute, Department of Biomedicine and Clinical Neuroscience (BIONEC), Faculty of Medicine, University of Palermo, Palermo, Italy
Aim: The aim of the present study was to assess the function of the optic pathway in type 2 diabetics without retinopathy (40 subjects) or con mild non-proliferative diabetic retinopathy (40 subjects).
Methods: VEPs, elicited by means of pattern-reversal stimulation, were studied in a group of 80 non-insulin-dependent diabetics.
Results: In subjects suffering from diabetes for less than 10 years, with mild retinopathy or without retinopathy, the amplitude N75-P100 decreased, and this is statistically significant with stimulation at 15’. As the time from disease onset increases, VEP latency (P100) shows a greater increase with the use of small checks (15’), than with large checks (30’) and this becomes statistically significant after 20 years (P=0.01). There is a positive correlation between VEP-latency and the duration of the diabetes. No correlation was found with other parameters taken into consideration, such as patient age, plasma-glucose level at 8 a.m., mean daily plasma glucose and glycosylated-hemoglobin.
Conclusion: The amplitude N75-P100 decreased in subjects suffering from diabetes type 2 for less 10 years. VEP latency increases (in type 2 diabetics) 10 years after disease onset. Functional deficiency of the central retinal layers seems to precede retinopathy. This finding might prove to be a useful index for the evaluation of visual neuropathy.