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Y. Maruyama, A. Iwasaki, S. Kishi; Differentiation of Outer Retinal Swelling and Retinal Detachment in Idiopathic Epiretinal Membrane Using OCT1 and OCT 3 . Invest. Ophthalmol. Vis. Sci. 2003;44(13):4909.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To differentiate outer retinal edema and serous retinal detachment in idiopathic epiretinal membrane (ERM) using optical coherence tomography OCT1 and OCT3. Methods: We examined retinal tomography in 12 eyes of 12 cases with ERM using OCT1 and OCT3 at the same time. ERM involved the macula in the all 12 eyes. Ages of patients ranged 48 to 77 years old (mean: 66). Cases were consisting of 3 men and 9 women. Their visual acuity varied form 0.3 to 0.9 (mean: 0.6). One eye showed macular pseudohole. All 12 eyes had posterior vitreous detachment. OCT imaging at fovea were obtained on the line with the length 5 mm. The cross sectional images of OCT1 were compared with those of OCT3. Results: All but one eye with macular pseudohole formation lost foveal depression and the retinal thickness were increased. The retina was most thickened at the fovea (240 to 420 µm). ERM was visualized in all 12 eyes using OCT3, while they were identified only in 6 eyes using OCT1. OCT1 showed low reflective area in the outer retina above retinal pigment epithelium (RPE) in the 11 eyes with retinal swelling. It simulated outer retinal edema or serous retinal detachment. OCT3 revealed a fine reflective layer immediately anterior to RPE which suggested the outer segment of photoreceptors. The low reflective area appeared to be located in outer nuclear layer. In one eye with macular pseudohole, retina was thickened at the margin of the foveal depression. The thickness of outer nuclear layer was identical at the central fovea and perifoveal area. Conclusions: OCT3 could differentiate retinal swelling from serous retinal detachment showing the presence of outer segment layer of photoreceptor in ERM. Retinal swelling was prominently located in outer nuclear layer in ERM.
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