title: Pattern Visual Evoked Potential Changes in Diabetic Patients without Retinopathy.
abstract: Purpose.To assess the different check sizes of pattern visual evoked potential (PVEP) in diabetic patients without retinopathy according to HbA1c levels and diabetes duration.Methods.Fifty-eight eligible patients with type 2 diabetes mellitus and 26 age- and sex-matched healthy controls were included in the study. Only the right eye of each patient was analyzed. All of the patients underwent a comprehensive ophthalmic examination, and the PVEPs were recorded.Results.There was a statistically significant difference in P100 latency in 1-degree check size and in N135 latency in 2-degree check size between controls and patient groups which have different HbA1c levels. There were statistically significant, positive, and weak correlations with diabetes duration and P100 latency in 7-minute and 15-minute check sizes and N135 latency in 15-minute check size.Conclusions.It was showed that there were prolongations in P100 latency only in 1-degree check size and in N135 only in 2-degree check size in diabetic patients without retinopathy. There was statistically significant correlation between diabetes duration and P100 and N135 latencies in different check sizes.
authors.affiliation: Department of Ophthalmology, Dr. Nafiz Korez Sincan State Hospital, Ankara, Turkey.
authors.forename: Ozgur
authors.identifier: 0000-0001-8669-4936
authors.initials: O
authors.lastname: Balta
authors.affiliation: Department of Ophthalmology, Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Gulten
authors.initials: G
authors.lastname: Sungur
authors.affiliation: Department of Ophthalmology, Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Yakin
authors.affiliation: Department of Ophthalmology, Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Nurten
authors.initials: N
authors.lastname: Unlu
authors.affiliation: Department of Family Medicine, Yildirim Beyazit University Faculty of Medicine, Ankara, Turkey.
authors.forename: Oyku Bezen
authors.initials: OB
authors.lastname: Balta
authors.affiliation: Department of Ophthalmology, Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Firdevs
authors.initials: F
authors.lastname: Ornek