Corneal ring segment

. Recent surgical alternative to a corneal graft - a parenthesizing vnutristromalnyh corneal ring segments. The small slit becomes in cornea peripheries, and two thin complexes metakrulata multimethyl slipped between stratums of a corneal stroma on any side of a pupil, a slit, then the closed. Segments expose against curvature of a cornea, flattening peak of a cone and returning it is to more natural shape. The procedure executed on the out-patient warrant under local anesthesia, offers advantage of to be reversible and even potentially replaceable as it does not involve excision of an eye tissue.

    Two basic types: vnutristromalnyh accessible rings are known for trade marks of rings Intacs and Ferrara. Intacs are more flat and is less central placed than prismatic rings of Ferrara. Intacs at first have been approved by Guidance on sanitary inspection behind foodstuff and medicines in the United States in 1999 for short-sightedness; it has been dilated on treatment keratoconus in July 2004. Rings of Ferrara wait for Guidance approbation on sanitary inspection behind foodstuff and medicines for keratoconus. Development on concept involves injection of the transparent synthetic gel in the channel to which bother through a stroma. As gel polymerises, it strains and takes similar properties to prestressly generated rings.

    Clinical examinations on efficiency vnutristromalnyh rings on keratoconus are in their early stages, and effects while in general were encouraging, though they should enter nevertheless wide acceptance with all refracting surgeons. Together with a through keratoplasty the demand for some correcting of vision in the form of hydrophilic (soft) contact lenses or points can remain the subsequent to activity. Potential complications vnutristromalnyh rings include casual penetration through in the forward cabinet of an eye at formation of the channel, a postoperative infection of a cornea, and migration or expression of segments. Rings offer good chance of recover of vision even differently difficultly to treat eyes, but it is not guaranteed, and in several cases can worsen.