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Cyclotorsional eye motion occurring between wavefront measurement and refractive surgery
1Visx, Inc., Santa Clara, California 95051, USA. dimitric@visx.com
Journal of Cataract and Refractive Surgery
|March 31, 2004
Summary
Eye cyclorotation up to 9.5 degrees occurs between wavefront measurement and laser eye surgery. This eye rotation, averaging 2.0 degrees, necessitates adjustments in laser ablation algorithms for precise refractive surgery outcomes.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Ophthalmic Imaging
Background:
- Accurate refractive surgery outcomes depend on precise eye alignment.
- Cyclorotation, or eye rotation, can occur between diagnostic measurements and surgical procedures.
Purpose of the Study:
- To quantify the degree of cyclorotation between wavefront measurement and laser refractive surgery.
- To assess the clinical significance of cyclotorsion in refractive surgery planning.
Main Methods:
- Utilized Visx WaveScan pupil camera for pre-operative eye imaging (51 eyes).
- Employed an infrared camera on the Visx Star S3 excimer laser for intraoperative imaging.
- Compared pre-operative and intraoperative images to quantify cyclotorsion.
Main Results:
- Individual eye cyclorotation reached up to 9.5 degrees.
- The average cyclorotation was approximately 2.0 degrees per eye.
- Excyclotorsion was the predominant rotational trend observed in 19 of 24 patients.
Conclusions:
- A low to moderate amount of cyclorotation occurs during the transition from seated to supine positions.
- Comparing eye position at measurement and surgery allows for algorithmic compensation of rotational displacement.
- Adjusting laser ablation based on measured cyclotorsion can improve refractive surgery accuracy.