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Published on: August 22, 2025
[Cyclorotation of the eye in wavefront-guided LASIK using a static eyetracker with iris recognition]
T Kohnen1, C Kühne, M Cichocki
1Klinik für Augenheilkunde, Johann-Wolfgang-Goethe-Universität, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany. kohnen@em.uni-frankfurt.de
Summary
Eye cyclorotation during LASIK surgery can cause visual aberrations. Iris recognition with static eye-trackers can detect and compensate for this rotation, improving laser eye surgery precision.
Area of Science:
- Ophthalmology
- Laser Surgery
- Optometry
Background:
- Accurate ablation zone centration is critical for successful wavefront-guided LASIK outcomes.
- Patient repositioning from sitting (aberrometry) to supine (surgery) can induce cyclorotation, leading to visual aberrations.
Purpose of the Study:
- To evaluate the occurrence and magnitude of cyclorotation in patients undergoing wavefront-guided LASIK.
- To assess the efficacy of a static eye-tracker with iris recognition in detecting and compensating for cyclorotation.
Main Methods:
- Wavefront-guided LASIK was performed on 20 patients (40 eyes) using a B&L excimer laser.
- A static eye-tracker utilizing iris recognition was employed to monitor eye position.
Main Results:
- Mean cyclorotation was 3.5 degrees, with up to 11 degrees observed in some eyes.
- Significant cyclorotation (>2 degrees) occurred in 65% of eyes.
- The static eye-tracker with iris recognition detected and could compensate for cyclorotation.
Conclusions:
- Cyclorotation is a common occurrence in myopic and myopic astigmatic eyes during the transition to supine position.
- Static eye-trackers with iris recognition offer a method to precisely position the ablation profile by detecting and compensating for cyclorotation.