<unk><unk><unk>  is a noninflammatory, unilateral or asymmetrically bilateral, slowly progressive thinning of the peripheral corneal stroma.
Terrien's marginal degeneration
Hill–Sachs lesion
Limbal nodule
Janeway lesion
Olney's lesions
Hollenhorst plaque
Perthes lesion
Feathery degeneration