Back in the 1980s and 1990s, radial keratotomy
had been a popular eye surgery for treating nearsightedness (myopia).
In that study it was postulated that the corneal damage, due to endothelial decompensation many years after RK, was caused by the long term damage arising from the corneal incisions (Sato's anterior-posterior radial keratotomy
) in combination with endothelial losses due to aging .
(22) Initially the laser was used to experimentally replicate the radial keratotomy
incisions, (23) but on the other hand, since 1.986 an engineer, Munnerlyn, who had been studying about the direct reshaping of cornea's central optical zone using tissue ablation on an extensive area, coined the term "photorefractive keratec-tomy", which consists in scraping off the corneal epithelium and applying the laser on the Bowman's membrane.
Sometime in late the 1980s, he learned of radial keratotomy
(RK), the surgical procedure designed to correct myopia.
Laser eye surgery--often referred to in the plan documents as radial keratotomy
and related surgical procedures--is the provision that is most commonly found in the plans' exclusions section.
The procedure, along with keratomileusis (LASIK), is rapidly replacing radial keratotomy
, which requires deep cuts in the cornea.
McDonald started performing refractive surgery -- such as RK, radial keratotomy
, where microscopic incisions are made around the center of the cornea to treat nearsightedness -- about a decade ago.
Implants would serve as a less permanent alternative to corrective surgical techniques such as radial keratotomy
or photorefractive keratectomy.
If you scroll down the DJO home page you'll also find links to patient information (very useful topics such as dry eyes, radial keratotomy
, "floaters and flashers," and the like) and a long selection of review-type questions and cases appropriate for preparing for the ophthalmology boards.
It differs from excimer laser procedures such as Photorefractive Keratectomy (PRK), Laser-Assisted Instrastromal In Situ Keratomileusis (LASIK), and traditional incisional surgeries such as Radial Keratotomy
(RK) because no incisions or laser ablations are used to cut or irretrievably remove corneal tissue; and from Intra Corneal Ring (ICR) and Intraocular Lens (IOL) procedures because nothing is inserted into the eye.
Approved procedures include radial keratotomy
(RK), photorefractive keratectomy (PRK), laser-assisted in-situ keratomileusis (LASIK) and more recently, intra-corneal rings.