Corneal ectatic disorders or corneal ectasia are a group of uncommon, noninflammatory,eye disorders characterised by bilateral thinning of the central, paracentral, or peripheralcornea.^[1]

• Keratoconus, a progressive, noninflammatory, bilateral, asymmetric disease, characterized by paraxial stromal thinning and weakening that leads to corneal surface distortion.^[2]
• Keratoglobus, a rare noninflammatory corneal thinning disorder, characterised by generalised thinning and globular protrusion of the cornea.^[3]
• Pellucid marginal degeneration, a bilateral, noninflammatory disorder, characterized by a peripheral band of thinning of the inferior cornea.^[4]
• 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 ofLASIK eye surgery.^[5]
• Terrien's marginal degeneration, a painless, noninflammatory, unilateral or asymmetrically bilateral, slowly progressive thinning of the peripheralcorneal stroma.^[6]

Usually diagnosed clinically by several clinical tests. Although some investigations might needed for confirming the diagnosis and to differentiate different types of corneal ectatic diseases.^{[citation needed]}

• Corneal topography
• Corneal tomography

Treatment options includecontact lenses andintrastromal corneal ring segments for correctingrefractive errors caused by irregular corneal surface,^[7][8]corneal collagen cross-linking to strengthen a weak and ectatic cornea,^[9] orcorneal transplant for advanced cases.

• International Journal of Keratoconus and Ectatic Corneal Diseases

• Disorders of sclera and cornea
• Eye diseases

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• Articles with unsourced statements from September 2022