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:: جلد 24، شماره 3 - ( مجله چشم پزشکی ایران 1391 ) ::
جلد 24 شماره 3 صفحات 52-56 برگشت به فهرست نسخه ها
Induced Secondary Astigmatism and Horizontal Coma after LASIK for Mixed Astigmatism
دکتر سیدفرزاد محمدی، دکتر مریم تحویلداری
چکیده:   (9239 مشاهده)

Purpose : To describe a distinctive pattern of induced higher order aberration (HOA) after LASIK for mixed astigmatism

Case reports : Wavefront-guided LASIK with iris recognition and eye tracking (Excimer laser: Technolas 217z APT protocol Microkeratome: Moria CB) was performed in six eyes with moderate to high mixed astigmatism for a nominal optical zone of 6.3 mm. The patients were re-examined beyond 9 months postoperatively.

Results : Postoperative uncorrected distance visual acuities (UDVA) equaled preoperative corrected distance visual acuities (CDVA). The cycloplegic cylinder increased an average of about 2.50 D compared with dry retinoscopy. Significant increases in HOAs were detected with pupils dilated, specially in the amounts of secondary astigmatism (mean change=0.41 µm) and horizontal coma (HC) (mean change=0.29 µm). Large kappa angles were detected in all of the eyes studied (mean=7.45̊).

Conclusion : The bitoric ablation profile of mixed astigmatism LASIK may induce significant secondary astigmatism which causes a remarkable disparity between dry and wet refraction and manifests as an unusual skiascopic reflex during wet retinoscopy. A large kappa angle may cause tilted ablation and induce HC.

  

Iranian Journal of Ophthalmology 201224(3):52-56 © 2012 by the Iranian Society of Ophthalmology
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نوع مطالعه: پژوهشی | موضوع مقاله: سگمان قدامی
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Mohammadi S, Tahvildari M, Abdolahinia T. Induced Secondary Astigmatism and Horizontal Coma after LASIK for Mixed Astigmatism. Iranian Journal of Ophthalmology. 2012; 24 (3) :52-56
URL: http://irjo.org/article-1-703-fa.html

محمدی سیدفرزاد، تحویلداری مریم. Induced Secondary Astigmatism and Horizontal Coma after LASIK for Mixed Astigmatism. مجله چشم پزشکی ایران. 1391; 24 (3) :52-56

URL: http://irjo.org/article-1-703-fa.html



جلد 24، شماره 3 - ( مجله چشم پزشکی ایران 1391 ) برگشت به فهرست نسخه ها
مجله چشم پزشکی ایران Iranian Journal of Ophthalmology
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