Changes in choroidal thickness in various eye diseases on OCT

Although the choroid plays an important role in the structure and function of the eye, it has not been studied in detail in vivo. Improvements in optical coherence tomography (OCT) technology allow routine imaging of the choroid and deep structures of the optic nerve in most patients. Several variables, such as age, axial length, and time of day, influence choroidal thickness and must be considered when interpreting choroidal thickness data. Choroidal thickness can be used to differentiate between central serous chorioretinopathy (CSC), polypoidal choroidal vasculopathy (PCV), and exudative age-related macular degeneration (AMD). Enhanced depth optical coherence tomography (EDI-OCT) of the choroid can detect tumors that cannot be detected by ultrasound. Studying the choroid can help us gain insight into the pathogenesis of certain diseases ‒ AMD, CSC, choroidal tumors, and PCV. The purpose of the study is to review the current literature on choroidal imaging using OCT. Key words: choroid, optical coherence tomography, diabetic retinopathy, age-related macular degeneration, central serous retinopathy