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Phototherapeutic keratectomy (PTK) is a type of eye surgery that uses a laser to treat various ocular disorders by removing tissue from the cornea. PTK allows the removal of superficial corneal opacities and surface irregularities. It is similar to photorefractive keratectomy, which is used for the treatment of refractive conditions.
However, recurrence of the disease in the donor graft may happen. Superficial corneal dystrophies do not need a penetrating keratoplasty as the deeper corneal tissue is unaffected, therefore a lamellar keratoplasty may be used instead. [citation needed] Phototherapeutic keratectomy (PTK) can be used to excise or ablate the abnormal corneal tissue.
Photorefractive keratectomy at U.S. Naval Medical Center San Diego. [ edit on Wikidata ] Photorefractive keratectomy ( PRK ) and laser-assisted sub-epithelial keratectomy (or laser epithelial keratomileusis [ 1 ] ) ( LASEK ) are laser eye surgery procedures intended to correct a person's vision, reducing dependency on glasses or contact lenses .
Where episodes frequently occur, or there is an underlying disorder, one medical, [6] or three types of surgical curative procedures may be attempted: [7] use of therapeutic contact lens, controlled puncturing of the surface layer of the eye (Anterior Stromal Puncture) and laser phototherapeutic keratectomy (PTK).
Large vernal plaque requires surgical excision. Ulcerative vernal keratitis require surgical treatment in the form of debridement, superficial keratectomy, excimer laser therapeutic keratectomy, as well as amniotic membrane transplantation to enhance re-epithelialisation.
In 1980, Swinger performed first keratomileusis surgery in US. [2] In 1985, Krumeich and Swinger introduced non-freeze keratomileusis technique, [2] it remained a relatively imprecise technique. In 1974 a refractive procedure called Radial Keratotomy (RK) was developed in the USSR by Svyatoslav Fyodorov and later introduced to the United States ...
Band keratopathy has several causes. These causes include uveitis, interstitial keratitis, superficial keratitis, phthisis, sarcoidosis, trauma, intraocular silicone oil, systemic diseases (high levels of calcium in the blood, vitamin D intoxication, Fanconi's Syndrome, low levels of phosphorus in the blood, gout, milk-alkali syndrome, myotonic dystrophy, and chronic mercury exposure).
[2] [3] Normal corneal thickness is about 520 to 540 microns in the centre and 600 to 620 microns in the periphery. [4] Pre descemet's layer which is dissected in PDEK, measures about 10.15±3.6 microns thick. [5] The descemet membrane (DM) measures about 16±2 microns (range 13-20μ) thick and the normal endothelium is about 5 microns thick.