The use of microperimetry in assessing visual function after vitrectomy with endotamponade due to reghmatogenous retinal detachment (RRD).

Author: Anna Sukhanova (Russian Federation)

Co-authors: Rinat Fayzrakhmanov

Purpose

To evaluate changes in retinal sensitivity after vitrectomy with gas and silicone oil tamponade due to rhegmatogenous retinal detachment.

Setting/Venue

N. I. Pirogov National Medical and Surgical Center of the Ministry of Healthcare of the Russian Federation.

Methods

20 cases of surgery treatment of patients with primary macula-off RRD were enrolled. All cases were divided in two groups depending on the type of endotamponade. In the 1st group (10 eyes) a vitreoretinal surgery with silicone oil tamponade (1300 cSt) was performed. The 2d group (10 eyes) included only cases with a gas (C2F6) tamponade. The control group included contralateral eyes without ophthalmic pathology. An outcome was best-corrected visual acuity (BCVA) and retinal sensitivity. The examination was performed 30 days after silicone oil removal for the 1st group and 30 days after a primary surgery with a gas tamponade for the 2d group. The participants underwent microperimetry in the expert mode 10°. The mean sensitivity threshold was calculated for each ring (zone I-IV) of the scanning grid, where zone I corresponded to 0°.

Results

The duration of the detachment did not differ between the groups (р =0,23). The mean macular sensitivity threshold in the 1st group was significantly reduced (19,7 ± 2,7* dB), both in comparison with the 2d group (p = 0.007) and the control group (p = 0.003). Differentiation by zones in the 1st group revealed a decrease in each analyzed zone in comparison with the control group and a decrease in zone II (p = 0.031) and in zone IV (p = 0.038) in comparison with the 2d group. In zone I of the 1st group the relative scotoma was revealed in 5 cases out of 15 (33%). The mean macular sensitivity threshold in the 2d group was significantly reduced in each zone in comparison with the control group. A strong direct correlation was found between BCVA and mean macular sensitivity threshold in the 2d group (r = 0.87).

Conlusions

There is a decrease in the functional parameters of the retina after vitrectomy with silicone oil in comparison with gas tamponade. This decrease is in the form of a reduction of retinal sensitivity in the 10° zone according to microperimetry data. Microperimetry is the preferred research method when assessing the dynamics of the functional parameters of the retina after vitrectomy with various types of tamponade.

Financial Disclosure

The authors received no specific external funding