Intrastromal corneal ring segments 3850208 218195820 2008-06-09T16:10:19Z Cosmic Latte 3190204 Reverted edits by [[Special:Contributions/129.137.178.76|129.137.178.76]] ([[User talk:129.137.178.76|talk]]) to last version by BillC [[Image:Intacsonfinger2.jpg|thumb|right|A pair of ''Intacs'' inserts.]] '''Intrastromal corneal rings''' (or '''intracorneal rings''') are small devices implanted in the [[eye]] to correct [[visual perception|vision]]. A typical vision correction using corneal rings would involve an [[ophthalmologist]] making a small incision in the [[cornea]] of the eye, and inserting two crescent or semi-circular shaped ring segments between the layers of the corneal [[stroma]], one on each side of the [[pupil]]. The embedding of the rings in the cornea has the effect of flattening the cornea and changing the [[refraction]] of light passing through the cornea on its way into the eye. Corneal rings are typically used for patients with mild to moderate [[myopia]] (-1.0 to -3.0 [[diopter]]s of correction and 1.0 diopter or less of [[astigmatism]]). An advantage over other surgical vision correction procedures like [[Photorefractive keratectomy|PRK]] or [[LASIK]] is that the implants are removable, which could allow for reversal or partial reversal of the correction, or replacement with different rings to change the amount of correction. Additional advantages are a lower risk of side effects, and a greater success rate of achieving the desired correction.{{fact|date=November 2007}} Potential complications are similar to other surgical vision correction procedures, and include [[infection]] and vision distortions, particularly problems with night vision. The ring segments themselves are made of [[PMMA]] (an [[acrylic glass]] more commonly known under the tradenames Perspex or Plexiglas). The leading manufacturer is Addition Technology, which markets the rings under the trade name Intacs. ==See also== *[[Eye surgery]] ==External links== *[http://www.getintacs.com GetIntacs.com] {{Eye surgery}} [[Category:Ophthalmology]] {{eye-stub}} [[de:Intra Cornea Ring]]