Changes in functional activity of the retina after vitrectomy in patients with diabetic retinopathy

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Abstract

Aim. To evaluate the functional state of the retina according to multifocal electroretinography and visual acuity in patients with proliferative diabetic retinopathy before and after vitrectomy.

Methods. 18 patients (19 eyes) were examined. Mean age was 57±15 years. All of patients were diagnosed with proliferative diabetic retinopathy complicated by vitreomacular traction syndrome. All the patients underwent vitrectomy. Visual acuity was measured and multifocal electroretinography was performed in all patients before and after surgery.

Results. During the optical coherence tomography, retinal profile deformation was revealed. Central retinal thickness was 347±106 microns. The average density of bioelectrical response of the macular area in patients with proliferative diabetic retinopathy complicated by vitreomacular traction, was sharply reduced and amounted to 44.987 nV/deg, in parafoveal area - 14.20 nV/deg. 1 month after vitrectomy averaged density of macular region bioelectrical response slightly increased and amounted to 51.52 nV/deg, in parafoveal area - 18.94 nV/deg. Visual acuity in patients before surgery was in average 0.09 (0.699 LogMAR). 1 month after pars plana vitrectomy visual acuity rose to an average of 0.32 (0.749 LogMAR).

Conclusion. In proliferative diabetic retinopathy, retinal thickness is increased, which is accompanied by multifocal electroretinography amplitudes depression; the correlation between morphological parameters of foveal avascular zone and its bioelectric activity was revealed.

About the authors

N A Shahbazova

National Ophthalmology Center named after Zarifa Aliyeva

Author for correspondence.
Email: rjafarova@bk.ru

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