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(a) Anterior segment SD-OCT horizontal OCT scan (parallel to the axis of the midpoint of the cornea on the nasal and particular sides) of a primary pterygium. (b) Anterior segment SD-OCT measures the thickness of pterygium at 1 mm in the limbus. The primary pterygium is the overgrown section attached to the cornea. The value of 251 μm represents the thickness of the pterygium at 1 mm in the limbus. The pterygium is present between the two arrows.
