-Bilateral, progressive, ectatic corneal disorder characterized by thinning of the cornea 1–2 mm away from the inferior limbus, and the corneal protrusion occurs above the area of thinning.
-Crab claw/ Butterfly patterns on the sagittal topographic map of anterior corneal curvature reveal steepening of the inferior corneal periphery and flattening of the cornea along the vertical meridian.
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