ObjectiveTo observe the subfoveal choroidal thickness (SFCT) and choriocapillary blood flow area (CBFA) in the patients with idiopathic macular hole (IMH).MethodsThis is a prospective clinical study. Thirty-two patients with unilateral IMH (4 in stage 2, 17 in stage 3, 11 in stage 4) and 32 age- and sex-matched normal controls were enrolled in this study. All eyes were divided into three groups, including group A (32 affected eyes), group B (32 fellow eyes) and group C (32 normal eyes of controls). There was no significant difference in age (t=0.865) and gender (χ2=0.000) in IMH patients versus normal control subjects (P＞0.05). There was no significant difference in refraction (F=0.957) and ocular axial length (F=0.562) between group A, B and C. The SFCT was detected by enhanced depth imaging of spectral-domain optical coherence tomography (OCT). The CBFA was detected by OCT angiography. The differences of SFCT and CBFA in three groups were analyzed by Kruskal-Wallis and non-parametric test.ResultsThe mean SFCT was (182.53±64.52) μm in group A, (199.21±73.07) μm in group B and (254.21±56.85) μm in group C respectively. The SFCT was thinner in group A and B than that in group C (Z=−4.362, −3.190; P＜0.05), but was the same in group A and B (Z=−1.171, P＞0.05). The mean CBFA was (5.09±0.31) mm2 in group A, (5.41±0.20) mm2 in group B and (5.39±0.15) mm2 in group C respectively. The CBFA was reduced in group A than that in group B and C (Z=−4.467, −4.048; P＜0.05), but was same in group B and C (Z=0.420, P＞0.05).ConclusionSFCT and CBFA are both reduced in IMH eyes.