Author/Authors :
Mohammadpour, Mehrdad Assistant Professor of Ophthalmology - Eye Research Center - Farabi Eye Hospital - Tehran University of Medical Sciences, Tehran , Hashemi, Hassan Professor of Ophthalmology - Eye Research Center - Farabi Eye Hospital - Tehran University of Medical Sciences, Tehran , Jabbarvand, Mahmoud Professor of Ophthalmology - Eye Research Center - Farabi Eye Hospital - Tehran University of Medical Sciences, Tehran , Hassanzad, Maryam Pediatric Respiratory Disease Research Cente - National Research Institute of Tuberculosis and Lung Disease (NRITLD) - Shahid Beheshti University of Medical Sciences, Tehran , Alsadat Sabet, Fatemeh Eye Research Center - Farabi Eye Hospital - Tehran University of Medical Sciences, Tehran , Fallah Tafti, Mehrnaz Eye Research Center - Farabi Eye Hospital - Tehran University of Medical Sciences, Tehran , Mahdaviani, Behnaz Eye Research Center - Farabi Eye Hospital - Tehran University of Medical Sciences, Tehran
Abstract :
Purpose: To determine cyclotorsional eye movement between the upright position and the supine
position, in Iranian patients with high preoperative astigmatism
Methods: This prospective cross sectional study contains 102 eyes of 59 patients who were
candidates for refractive surgery with Technolas 217z100 excimer laser system for correction
of high astigmatism. Wavefront measurements using Zywave II, Hartmann Shack aberrometer
were performed in seated position. For all patients the amount of cyclotorsion before surgical
procedure in supine position was measured by iris registration and the comparison between
preoperative examinations in seated position with the supine position resulting in the amount of
cyclotorsion was conducted by iris registration.
Results: The mean cyclotorsion was found 3.18±2.37 (SD) degrees significantly greater than zero
degrees (3.28±2.28 (SD) degrees in excyclotorsion and 3.01±2.54 (SD) degrees in incyclotorsion).
Excyclotorsion was predominant trend of rotation in comparison with incyclotorsion in both right
and left eyes. The amount of rotation greater than 2, 5 and 7 degrees occurred in 59.8%, 21.6%
and 5.9% of the eyes, respectively.
Conclusion: This study confirms significant rotational movement between the upright position and
the supine position. Proper registration for appropriate correction of astigmatism and higher order
aberrations (HAOs) for achieving optimal visual outcomes is recommended.
