Choroidal Thickness in Both Eyes of Patients with Unilateral Idiopathic Macular Hole

Abstract

To compare the choroidal thickness in the macular area in eyes with an idiopathic macular hole (IMH) with that of unaffected fellow eyes and eyes of healthy controls. A cross-sectional study. Fifty patients with unilateral IMH and 50 healthy controls. Enhanced depth imaging was obtained by spectral-domain optical coherence tomography in all patients and controls. Eyes were divided into 3 groups: 50 eyes in group A (affected eyes with IMH), 48 eyes in group B (unaffected fellow eyes), and 50 eyes in group C (right eyes of age- and sex-matched controls). Two independent graders individually measured the choroidal thickness. Choroidal thickness was measured from the posterior edge of the retinal pigment epithelium to the choroid-scleral junction in the subfoveal area and 1 and 3 mm away from the fovea in the superior, inferior, nasal, and temporal regions. Apical and basal diameters of macular holes (MHs) were measured in eyes with IMH. Statistical analysis was conducted to compare mean choroidal thicknesses. Choroidal thickness was significantly decreased in affected IMH eyes compared with unaffected fellow eyes in 48 patients (P = 0.005, paired t test). The mean subfoveal choroidal thickness (SFCT) was 206.82 ± 67.09 μm in group A, 228.34 ± 80.71 μm in group B, and 248.88 ± 63.10 μm in group C. The choroid was significantly thinner in group A (P = 0.002) than in group C. The SFCT in unaffected fellow eyes was lower than in controls, but without statistical significance (P = 0.177). The apical and basal size of the MH were not related to the underlying choroidal thickness (apical r=-0.267, P = 0.072; basal r = -0.259, P = 0.082). Choroidal thickness was thinner in affected eyes with IMH and in fellow unaffected eyes. This may suggest a contributing role of the perfusion of the choroid in the pathogenesis of IMH. If these findings are confirmed, we suggest that the fellow eyes with thinner choroid may be prone to IMH and should be followed up frequently.