ContextCortisol has been suggested as a risk factor for choroidal thickening, which may lead to retinal changes.ObjectiveTo compare choroidal thickness measurements using optical coherence tomography (OCT) in patients with endogenous active Cushing’s syndrome (CS) and to evaluate the occurrence of retinal abnormalities in the same group of patients.DesignCross-sectional study.SettingOutpatient clinic.PatientsEleven female patients with CS in hypercortisolism state as determined by the presence of at least two abnormal measurements from urinary cortisol 24 h, no suppression of cortisol with low dose dexamethasone suppression test, and nocturnal salivary cortisol levels and 12 healthy controls.MethodsChoroidal and retinal morphology was assessed using OCT.Main outcome measuresChoroidal thickness measurements and the presence of retinal changes.ResultsThe mean subfoveal choroidal thickness was 372.96 ± 73.14 µm in the patients with CS and 255.63 ± 50.70 µm in the control group (p < 0.001). One patient (9.09%) presented with central serous chorioretinopathy and one patient (9.09%) with pachychoroid pigment epitheliopathy.ConclusionChoroidal thickness is increased in the eyes of patients with active CS compared to healthy and matched control. Also, 18.18% of patients presented with macular changes, possibly secondary to choroidal thickening. While further studies are necessary to confirm our findings, excess corticosteroid levels seem to have a significant effect on the choroid and might be associated with secondary retinal diseases.