corneal ectasia

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A bulging forward of the cornea.
Farlex Partner Medical Dictionary © Farlex 2012

ectasia, corneal

A forward bulging and thinning of the cornea. It may result from a disease of the cornea (e.g. keratoconus), trauma, atrophy, raised intraocular pressure or as a complication of photorefractive surgery in which the corneal stroma has been left thinner than about 250 μm. If uveal tissue is included in the protrusion, the condition is called a staphyloma. If the ectasia is limited to a peripheral part of the cornea, it is called Terrien's disease or Terrien's marginal degeneration. It is due to degeneration of marginal corneal tissue with superficial vascularization and lipid deposition. It affects adult males more commonly than females and the eye has progressive astigmatism, typically against the rule. Therapy includes rigid contact lenses and occasionally keratoplasty. Syn. keratectasia; keratoectasia; kerectasis. See pellucid marginal degeneration; keratoglobus; staphyloma.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
07 Which of the following findings could indicate corneal ectasia based on the Pentacam images shown?
This observation was also found in our present study, showing medium positive correlation between IL1b, IL-4, and IL-6 and the severity of the corneal ectasia.
In the United States the company sells Photrexa Viscous and Photrexa, orphan drugs indicated for the treatment of progressive keratoconus and corneal ectasia following refractive surgery, which was FDA approved in 2016.
ICRS corrects corneal ectasia via shortening the cone length, causing corneal flattening to the periphery [127].
Keratoconus (KC), characterized by a bilateral, noninflammatory corneal ectasia and loss of visual function, is a degenerative disease of the cornea.
Among the topics are clinical biomechanics and the ocular response analyzer in ecstatic disease, pre-operative risk factors and medical and legal considerations of keratoectasia, studies of wavefront aberrometry in corneal ectasia, non-surgical treatment using contact lenses, and corneal cross-linking with riboflavin and ultraviolet irradiation.
Corneal ectasia detected 32 months after LASIK for correction of myopia and asymmetric astigmatism.
Second, it captures the stretching of the surface in corneal ectasia and the stretched surface area increases in proportion to the mean curvature value.
In fact, this is not the only time she received such an award aside from the many clinical studies and scientific experiences she shares with her colleagues at the society annually." This year, Dr Maria was one of the paper session panelists in Keratorefractive Enhancements and acted as course instructor on the subject 'Corneal Ectasia and Keratoconus Etiology, Classification, and Updated Treatment Techniques,' informed Sameer.
Corneal topography to assess progressive corneal ectasia
Evaluation of a risk factor scoring system for corneal ectasia after LASIK in eyes with normal topography.
It might be inferred that the risk of corneal ectasia will increase if the IOP exceed the normal values after the corneal refractive surgery.

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