Enhanced depth imaging optical coherence tomography: Choroidal thickness and correlations with age, refractive error, and axial length

■ BACKGROUND AND OBJECTIVE: To evaluate choroidal thickness at five macular locations and assess the correlations between choroidal thickness at these locations with age, refractive error, and axial length. ■ PATIENTS AND METHODS: Eighty-four eyes from 42 healthy adult volunteers were included. Enhanced depth imaging by spectral-domain optical coherence tomography was performed, and choroidal thickness was measured at five macular locations: subfoveal and 3 mm nasal, temporal, superior, and inferior. Correlations of choroidal thickness at each location with age, refractive error, and axial length were analyzed. ■ RESULTS: Mean choroidal thicknesses at the subfoveal, superior, inferior, temporal, and nasal locations were 293, 308, 264, 263, and 174 μm, respectively. A correlation was found between choroidal thickness, age, refractive error, and axial length at all locations. ■ CONCLUSION: Mean subfoveal choroidal thickness in healthy adults is approximately 300 μm. A correlation was found between choroidal thickness and all parameters studied.