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Related Experiment Videos

Ocular cyclotorsion during customized laser ablation.

Amy E Ciccio1, Daniel S Durrie, Jason E Stahl

  • 1Department of Ophthalmology, Kansas University Medical Center, USA.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|December 7, 2005
PubMed
Summary

Most eyes experience some cyclotorsion (eye rotation) when changing from a seated to supine position before laser eye surgery. Excyclotorsion was common, emphasizing the need for accurate alignment during wavefront-guided corneal ablation.

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Addendum.

Ophthalmology·2018

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Ablation

Background:

  • Patient positioning can induce cyclotorsion (eye rotation).
  • Accurate eye alignment is crucial for successful refractive surgery outcomes.
  • Wavefront-guided corneal ablation corrects higher-order aberrations and astigmatism.

Purpose of the Study:

  • To compare the measured difference and degree of cyclotorsion.
  • To assess cyclotorsion in eyes undergoing customized laser ablation.
  • To evaluate changes between wavefront measurement and laser surgery timing.

Main Methods:

  • 1019 eyes of 732 patients undergoing wavefront-guided corneal ablation were analyzed.
  • Horizontal eye axis was marked before wavefront measurement.

Related Experiment Videos

  • Cyclotorsional alignment was measured in the supine position before laser application.

    • Main Results:

    • A predominant trend of excyclotorsion was observed.
    • The mean cyclotorsion was 4.05 +/- 2.9 degrees, ranging from 0.5 to 17.5 degrees.
    • 68% of eyes showed cyclotorsion greater than 2 degrees, with excyclotorsion being more common in both right and left eyes.

    Conclusions:

    • The majority of eyes exhibited low to moderate cyclotorsion upon changing from seated to supine positions.
    • Excyclotorsion was the predominant pattern of rotation.
    • Precise registration before wavefront-guided corneal ablation is essential for optimal astigmatism and higher-order aberration correction.