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Abstract Choroid being the most vascular tissue in the eye, plays an important role in the pathophysiology of various ocular diseases. It provides nutrition to the outer retinal structures. Its role is established in various chorioretinal diseases such as central serous chorioretinopathy, Vogt–Koyanagi–Harada disease, high myopiarelated chorioretinal atrophies, age related macular degeneration, and polypoidal choroidal vasculopathy. Diabetic patients have many pathological changes in their choroid. These changes are increased tortuosity and focal vascular dilatation, micro aneurysms, and non-perfusion areas. Recent studies have analyzed choroidal structure and histopathological changes in diabetes using spectral-domain OCT. The reason for inadequate choroidal imaging in the past was that the beam passed inadequately through the retinal pigment epithelium. Now, with enhanced software EDI-OCT it is possible to capture an image that includes the sclera. |