Abstract
The purpose of this cross-sectional retrospective study was to determine the relationship between the retinal displacements and the retinal thickness in eyes with epiretinal membrane (ERM) after vitrectomy with internal limiting membrane (ILM) peeling. To accomplish this, we measured the retinal thickness using optical coherence tomography (OCT) and the retinal displacement using OCT angiography to obtain 3 mm × 3 mm en face images before, and 2, 4, and 8 weeks following the surgery from 20 eyes of 20 patients. The distance between the retinal vessel bifurcations and the fovea was significantly displaced centrifugally and asymmetrically in the 4 quadrants postoperatively (P < 0.001). The foveal avascular zone (FAZ) was significantly enlarged, and the central foveal thickness (CFT) and the inner nuclear layer (INL) thickness were significantly thinner postoperatively. The displacements were significantly correlated with the changes in the FAZ area (r = 0.717, P < 0.001), the CFT (r = − 0.702, P < 0.001), and the INL thickness (r = − 0.702, P < 0.001). In conclusion, the distance between the retinal bifurcations and the fovea was asymmetrically expanded after the surgery and was significantly correlated with the morphological changes. These results indicate that a horizontal macular contraction is correlated with vertical retinal contraction in the eyes with an ERM.
Highlights
The purpose of this cross-sectional retrospective study was to determine the relationship between the retinal displacements and the retinal thickness in eyes with epiretinal membrane (ERM) after vitrectomy with internal limiting membrane (ILM) peeling
Optical coherence tomography (OCT) enables clinicians to obtain information of the microstructures of the fovea, and earlier studies have reported that the retinal layer at the fovea is thickened and the outer retinal layers are disrupted in eyes with an ERM7–9
Our results showed that the distance between the retinal bifurcations and the fovea was significantly displaced centrifugally and asymmetrically in all 4 quadrants after the removal of the ERM by vitrectomy with ILM peeling
Summary
The purpose of this cross-sectional retrospective study was to determine the relationship between the retinal displacements and the retinal thickness in eyes with epiretinal membrane (ERM) after vitrectomy with internal limiting membrane (ILM) peeling. An idiopathic epiretinal membrane (ERM) is a relatively common retinochoroidal disorder in older individuals[1,2], and it can cause an inner retinal displacement of the macula area and a disruption of the foveal s tructure[3] These alterations cause traction on the retina in the macular area which can lead to visual dysfunction and metamorphopsia. The purpose of this study was to determine the relationship between the displacements of the inner retina and the retinal thicknesses in eyes with an ERM after vitrectomy with ILM peeling. The superficial foveal avascular zone (FAZ) and the displacement of the retina were measured in the OCTA images, and the retinal thickness including the central foveal thickness (CFT) was measured in the spectral-domain OCT (SD-OCT) B scan images of eyes with an ERM before and after its removal.
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