Korneal Refraktif Cerrahi
Özet
Korneal refraktif cerrahi, dünyada düzeltilebilir görme azlıklarının en sık nedeni olan miyopi, hipermetropi, astigmatizma ve presbiyopiyi düzeltmek amacıyla uygulanan güvenli ve yaşam kalitesini artıran prosedürlerdir. Gözün kırıcılığının büyük kısmını sağlayan kornea; epitel, bowman, stroma, descement ve endotel tabakalarından oluşur. Tarihsel süreçte 1850'lerde insizyonel yöntemlerle (radyal ve astigmatik keratotomi) başlayan cerrahi, günümüzde lazer teknolojilerinin gelişmesiyle yerini daha gelişmiş tekniklere bırakmıştır. Bu modern yöntemler arasında epitelin uzaklaştırılarak stromanın şekillendirildiği yüzey ablasyonları (PRK, Trans PRK, LASEK, Epi-Lasik); mikrokeratom veya femtosaniye lazerle flep oluşturulan ve hızlı görsel iyileşme sunan LASIK; ve sağlam kornea içinden femtosaniye lazerle lentikül çıkarılması prensibine dayanan, özellikle kuru göz olgularında tercih edilen SMILE cerrahisi yer almaktadır. Her tekniğin hastanın kornea kalınlığına, kırma kusuru derecesine ve anatomik yapısına göre değişen belirli endikasyonları, avantajları ve ektazi, kuru göz, enfeksiyon gibi potansiyel komplikasyonları bulunmaktadır. Gelişen teknoloji sayesinde bu operasyonların başarı oranları artarken komplikasyon riskleri azalmaktadır.
Corneal refractive surgery encompasses safe and quality-of-life-enhancing procedures performed to correct myopia, hyperopia, astigmatism, and presbyopia, which are the most common causes of correctable visual impairment worldwide. The cornea, providing most of the eye's refractive power, consists of the epithelium, Bowman's layer, stroma, Descemet's membrane, and endothelium. Beginning historically in the 1850s with incisional methods like radial and astigmatic keratotomy, refractive surgery has transitioned into advanced laser technologies. Modern techniques include surface ablasions (PRK, Trans PRK, LASEK, Epi-Lasik), where the epithelium is removed to reshape the stroma; LASIK, which involves creating a corneal flap using a microkeratome or femtosecond laser for rapid visual recovery; and corneal lenticular surgeries like SMILE, based on extracting a lenticule through a small incision, preferred especially in dry eye cases. Each technique has specific indications, advantages, and potential complications such as ectasia, dry eye, or infection, depending on the patient's corneal thickness, degree of refractive error, and anatomical eligibility. Advancing technology continuously increases success rates while reducing complication risks.
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