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Comparison of Astigmatism Following Phacoemulsification Cataract Surgery with Superior Corneal Incision and Steepest Axis Corneal Incision

مقارنة اللابؤرية التالية لجراحة الساد باستحلاب العدسة (الفاكو) بالشق القرني العلوي والشق القرني على المحور الأكثر تحدبا" (خبرة مشفى الأسد الجامعي في اللاذقية بين عامي 2012-2013)

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 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




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The purpose of this paper is to determine whether there is a difference in the postoperative corneal astigmatism and uncorrected visual acuity UCVA as well as best corrected visual acuity BCVA between 2 types of clear corneal incisions used in phacoemulsification: the superior and on the steepest clear corneal incision. This study included 40 patients with cataract and mild to moderate corneal astigmatism (0.50 D - 2.00 D) who underwent phacoemulsification with foldable posterior chamber lens (with 3.2mm corneal incision). Patients were randomly divided into two groups: superior clear corneal incision group SCCI (20 eyes) and on the steepest clear corneal incision group OCCI (20 eyes). Measurements included corneal astigmatism by Keratometry, UCVA and BCVA. These Measurements were taken on first day,1 week, 2 weeks,1, 2,3 and 6 months. The mean preoperative corneal astigmatism was (1.24 D ± 0.44),(1.25 D ± 0.44) in superior corneal incision group, and on the steepest corneal incision group, respectively. After 6 months postoperatively, the mean corneal astigmatism was (1.53 D ± 0.49) in SCCI group, (1.03 D± 0.39) in OCCI group, with statistically significant difference (p<0.001).There was statistically significant difference in UCVA. But there was no statistically significant difference in BCVA. The paper concludes that compared with SCCI, the OCCI could correct some corneal astigmatism


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Research summary
تهدف هذه الدراسة إلى تحديد وجود اختلاف في اللابؤرية القرنية والقدرة البصرية غير المصححة وبأفضل تصحيح بعد جراحة الساد باستخدام استحلاب العدسة (الفاكو) بين نوعين من الشقوق القرنية: الشق القرني العلوي والشق القرني على المحور الأكثر تحدباً. شملت الدراسة 40 مريضاً يعانون من الساد ولديهم لابؤرية قرنية خفيفة إلى متوسطة، وتم تقسيمهم عشوائياً إلى مجموعتين: مجموعة الشق القرني العلوي (20 عين) ومجموعة الشق القرني على المحور الأكثر تحدباً (20 عين). تم قياس اللابؤرية القرنية والقدرة البصرية غير المصححة وبأفضل تصحيح في فترات زمنية مختلفة بعد الجراحة (اليوم الأول، أسبوع، أسبوعين، شهر، شهرين، 3 أشهر، و6 أشهر). أظهرت النتائج أن الشق القرني على المحور الأكثر تحدباً قد يصحح جزءاً من اللابؤرية القرنية بشكل أفضل من الشق القرني العلوي، حيث كان هناك فرق هام إحصائياً في اللابؤرية القرنية والقدرة البصرية غير المصححة بين المجموعتين، بينما لم يكن هناك فرق هام إحصائياً في القدرة البصرية بأفضل تصحيح بين المجموعتين. توصلت الدراسة إلى أن اختيار موقع الشق الجراحي يمكن أن يؤثر على نتائج اللابؤرية القرنية والقدرة البصرية بعد جراحة الساد، مما قد يساعد في تحسين النتائج البصرية وتقليل الاعتماد على النظارات بعد الجراحة.
Questions related to the research
  1. ما هو الهدف الرئيسي من هذه الدراسة؟

    الهدف الرئيسي هو تحديد وجود اختلاف في اللابؤرية القرنية والقدرة البصرية غير المصححة وبأفضل تصحيح بعد جراحة الساد باستخدام استحلاب العدسة بين نوعين من الشقوق القرنية: الشق القرني العلوي والشق القرني على المحور الأكثر تحدباً.

  2. كم عدد المرضى المشاركين في الدراسة؟

    شملت الدراسة 40 مريضاً يعانون من الساد ولديهم لابؤرية قرنية خفيفة إلى متوسطة.

  3. ما هي النتائج الرئيسية للدراسة؟

    النتائج الرئيسية هي أن الشق القرني على المحور الأكثر تحدباً قد يصحح جزءاً من اللابؤرية القرنية بشكل أفضل من الشق القرني العلوي، وكان هناك فرق هام إحصائياً في اللابؤرية القرنية والقدرة البصرية غير المصححة بين المجموعتين.

  4. هل كان هناك فرق هام إحصائياً في القدرة البصرية بأفضل تصحيح بين المجموعتين؟

    لا، لم يكن هناك فرق هام إحصائياً في القدرة البصرية بأفضل تصحيح بين المجموعتين.


References used
SIMSEK,S; YASAR,T; DEMIROK,A; CINAL,A; YILMAZ,O.F.Effect of superior and temporal clear corneal incisions on astigmatism after sutureless phacoemulsification. Journal of Cataract & refractive surgery. Turkey, Vol. 24, N°.4, April 1998, 515- 518
OlSON, R. J; CRANDALL, A. S. Prospective Randomized Comparison of Phacoemulsification Cataract Surgery With a 3.2-mm vs a 5.5-mm Sutureless Incision . American Journal of Ophthalmology. USA, Volume.125, Issue .5, May 1998, Pages 612–620
OZYOL , E; et al . Analyses of surgically induced astigmatism and axis deviation in microcoaxial phacoemulsification. Int Ophthalmol.Turkey, Vol.31, N°.3, Oct 2013, 225-227
OZYOL, E ; OZYOL, P,et al . The relation between superior phacoemulsification incision and steep axis on astigmatic outcomes. Int Ophthalmol. Turkey, Vol .32, N°.6 , Dec 2012, 565-570
BORASIO , E ; MEHTA , J .S; MAURINO ,V. Torque and flattening effects of clear corneal temporal and on-axis incisions for phacoemulsification . Journal of cataract & Refractive surgery .United Kingdom, Vol . 32, N °.12 , Dec 2006, 2030-2088
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