12/25/2023 0 Comments Layers of retina![]() ![]() However, there is no systematic review of studies investigating the effect of SO tamponade on retinal layers. Studies have been conducted regarding the effect of SO tamponade on retinal and choroidal thickness in recent years. reported a decrease in the retinal layer thickness, while no significant change was observed in the choroidal thickness. showed that the subfoveal choroidal thickness (SFCT) was reduced in patients receiving SO tamponade. on patients with RD, it was found that in the SO tamponade group, there was a marked reduction in the inner and outer retinal layer thickness compared to the gas tamponade group. Recent studies examining the effect of retinal and choroidal layers have reported controversial results, including a study by Goker et al., which found that the thickness of the inner nuclear layer (INL) and outer plexiform layer (OPL) increased in the eyes with SO tamponade in comparison with the fellow healthy eyes. Recent studies also suggest that visual abnormalities, such as decreased foveal sensitivity, central scotoma, and macular dysfunction, may be related to SO tamponade. Besides, in RRD patients without macular involvement, the prevalence of unexplained vision loss is higher after SO tamponade as compared to gas tamponade. Also, some researchers have shown that SO tamponade may have a negative long-term effect on retinal microcirculation. Optical coherence tomography shows that long-term SO tamponade may have a negative effect on the thickness of retinal layers in some patients. Mild vision loss may occur after SO removal, usually due to postoperative cystoid macular edema (CME), hypotony, optic neuropathy, and development of epiretinal membranes nevertheless, there are some cases of visual loss that do not have a certain cause The possible mechanisms include macular dysfunction, mostly of ganglion and bipolar cell synapses, and optic nerve damage due to SO infiltration. The long-term SO tamponade complications include secondary glaucoma, cataract, optic neuropathy, band keratopathy, and retinal toxicity. Although there is a consensus on what necessitates gas or SO tamponade, they can be still selected at the discretion of the surgeon or based on regional differences. Silicone oil (SO) and gas are two of the most commonly used tamponading agents in vitreoretinal surgery, each with its own advantages and disadvantages. Retinal surgery is increasingly used for the repair of RRD, and recent developments in techniques and instruments have improved the outcomes. Rhegmatogenous retinal detachment (RRD) is the most common type of RD, occurring in one per 10,000 people each year. It can be classified as rhegmatogenous, tractional, or exudative. Retinal detachment (RD) is one of the leading causes of permanent vision loss. The SO tamponade had a significant effect on the reduction of retinal layers and the subfoveal choroidal thickness. However, there was no significant difference in the subfoveal choroidal thickness before and after SO removal (WMD = − 1.13, 95% CI: − 5.97, 3.71 I 2 = 87.6%). Compared to the preoperative stage, the SO tamponade could significantly reduce the subfoveal choroidal thickness in patients with RRD (WMD = − 18.67, 95% CI: − 30.07, − 1.28 I 2 = 80.1%). No significant change was found in CMT between the eye with SO tamponade (after SO removal) and the fellow healthy eye in patients with RRD (WMD = − 3.52 95% CI: − 17.63, 10.59 I 2 = 68.6%). The meta-analysis showed that the SO tamponade could significantly reduce the central macular thickness (CMT) in patients with RRD as compared to gas tamponade WMD = − 14.91 95% CI: − 22.23, − 7.60 P < 0.001, I 2 = 71%). Sixteen studies (n = 391) met the inclusion criteria. Two reviewers independently searched and extracted the data. MethodsĪ literature search was performed in Web of Science, Scopus, ProQuest, Embase, Clinical Key, Science Direct, Cochrane Library, and Springer, as well as Persian databases, including IranDoc, MagIran, SID, MOH thesis, and MOH articles until June 2020. To evaluate the effects of intravitreal silicone oil (SO) on the retinal and choroidal thickness in eyes with rhegmatogenous retinal detachment (RRD).
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