Journal of the Korean Ophthalmological Society 2003;44(9):2099-2104.
Published online September 1, 2003.
Evaluation of the Ocular Cyclotorsion During Laser in Situ Keratomileusis.
Woon Bong Jwa, Soon Jae Hong, Jong Ho Lee, Jae Myung Lee
1Kangnam Eyence Eye Clinic, Seoul, Korea. jwaeye@iloveeye.com
2Chungdam BalGeunSeSang Eye Clinic, Seoul, Korea.
라식수술시 생길 수 있는 눈의 회선현상에 대한 조사
좌운봉 ( Jwa Un Bong ) , 홍순재 ( Hong Sun Jae ) , 이종호 ( Lee Jong Ho ) , 이제명 ( Lee Je Myeong )
Abstract
PURPOSE
To evaluate the presence, degree and direction of ocular cyclotorsion in eyes undergoing laser in situ keratomileusis (LASIK). METHODS: We measured the presence, degree and torsional direction of 161 eyes of 88 patients who underwent LASIK for myopic and hyperopic astigmatism with LADARVision 4000 excimer laser (Alcon Summit Autonomous). Preoperatively, each eye was marked at the 3, 9-o'clock conjunctival area with marking pen under the slit lamp observation with a horizontal beam while the patient was seated upright. After lifting of corneal flap and acquiring of LADARVision4000 auto-tracking system, the presence and torsional direction was confirmed on the computer monitor and the rotational deviation degree was measured from horizontal reference line by software program built in laser computer system before the laser exposure. RESULTS: There was a cyclotorsional deviation in 144 eyes (89%). The counter-clockwise rotation was shown in 99 eyes (69%) and clockwise rotation in 45 eyes (31%). Mean ocular torsional misalignment was 3.8 +/- 2.9 degrees (right eye; 4.7 +/- 2.9 degrees, left eye; 3.5 +/- 2.4 degrees). 85 eyes (53%) had a torsional deviation less than 4 degrees and 5 eyes (3%) had a deviation greater than 10 degrees. CONCLUSIONS: A misalignment of astigmatism axis caused by ocular cyclotorsion was known as a reason of astigmatism undercorrection during LASIK. Thus, preoperative marking on conjunctiva and cyclotorsional axis alignment before laser treatment may reduce the incomplete astigmatism correction in LASIK.
Key Words: Astigmatism axis;Cyclotorsion;Undercorrection


ABOUT
BROWSE ARTICLES
EDITORIAL POLICY
FOR CONTRIBUTORS
Editorial Office
SKY 1004 Building #701
50-1 Jungnim-ro, Jung-gu, Seoul 04508, Korea
Tel: +82-2-583-6520    Fax: +82-2-583-6521    E-mail: kos08@ophthalmology.org                

Copyright © 2024 by Korean Ophthalmological Society.

Developed in M2PI

Close layer
prev next