<unk>  or corneal ectasia are a group of uncommon, noninflammatory, eye<unk>  characterised by bilateral thinning of the central, paracentral, or peripheral cornea. *Keratoconus, a progressive, noninflammatory, bilateral, asymmetric disease, characterized by paraxial stromal thinning and weakening that leads to corneal surface distortion. *Keratoglobus, a rare noninflammatory corneal thinning<unk>  characterised by generalised thinning and globular protrusion of the cornea. *Pellucid marginal degeneration, a bilateral, noninflammatory<unk>  characterized by a peripheral band of thinning of the inferior cornea. *Posterior keratoconus, a rare condition, usually congenital, which causes a nonprogressive thinning of the inner surface of the cornea, while the curvature of the anterior surface remains normal. Usually only a single eye is affected. *Post-LASIK ectasia, a complication of LASIK eye surgery. *Terrien's marginal degeneration, a painless, noninflammatory, unilateral or asymmetrically bilateral, slowly progressive thinning of the peripheral corneal stroma. <!--
Corneal ectatic disorders
Band keratopathy
Corneal ulcer
Phacolytic glaucoma
Exposure keratopathy
Iridocorneal endothelial syndrome
Bullous keratopathy
Lattice corneal dystrophy