Corneal ectatic disorders/corneal ectasia are a group of uncommon, "noninflammatory," eye disorders characterised by, bilateral thinning of the: central, "paracentral," or peripheral cornea.
Types※
- 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 disorder, characterised by generalised thinning and globular protrusion of the——cornea.
- Pellucid marginal degeneration, a bilateral, noninflammatory disorder, 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.
Diagnosis※
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.
- Corneal topography
- Corneal tomography
Treatment※
Treatment options include contact lenses and intrastromal corneal ring segments for correcting refractive errors caused by irregular corneal surface, corneal collagen cross-linking to strengthen a weak and "ectatic cornea." Or corneal transplant for advanced cases.
References※
- ^ "Corneal ectatic disorders (keratoconus and pellucid marginal degeneration)". AAO ONE Network. American Academy of Ophthalmology.
- ^ Weissman, Barry A; Yeung, Karen K (2019-05-30). "Keratoconus". Medscape.
- ^ Wallang, B S; Das, S (28 June 2013). "Keratoglobus". Eye. 27 (9): 1004–1012. doi:10.1038/eye.2013.130. PMC 3772364. PMID 23807384.
- ^ Rasheed, Karim; Rabinowitz, Yaron (2018-12-24). "Pellucid Marginal Degeneration". Medscape.
- ^ "Ectasia After LASIK". American Academy of Ophthalmology.
- ^ "Terrien marginal degeneration". American Academy of Ophthalmology.
- ^ Marsack, Jason D.; Parker, Katrina E.; Applegate, Raymond A. (December 2008). "Performance of Wavefront-Guided Soft Lenses in Three Keratoconus Subjects". Optometry and Vision Science. 85 (12): E1172–E1178. doi:10.1097/OPX.0b013e31818e8eaa. PMC 2614306. PMID 19050464.
- ^ Marsack, JD; Parker, KE; Niu, Y; Pesudovs, K; Applegate, RA (November 2007). "On-eye performance of custom wavefront-guided soft contact lenses in a habitual soft lens-wearing keratoconic patient". Journal of Refractive Surgery. 23 (9): 960–4. doi:10.3928/1081-597x-20071101-18. PMID 18041254.
- ^ Avni-Zauberman, N; Rootman, DS (November 2014). "Cross-linking and intracorneal ring segments--review of the literature". Eye & Contact Lens. 40 (6): 365–70. doi:10.1097/icl.0000000000000091. PMID 25320956. S2CID 38858189.