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Assessing Eye Movement Dynamics and Fixation Stability Between Eyes During Same-Session Bilateral LASIK.

Soodabeh Darzi1, Lily M Chacra2, Samuel Arba-Mosquera1

  • 1SCHWIND Eye-Tech-Solutions, Kleinostheim, Germany; and.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|September 9, 2025
PubMed
Summary
This summary is machine-generated.

Eye movements during femtosecond laser-assisted in situ keratomileusis (FS-LASIK) show greater vertical variability. The second eye operated on exhibits earlier and more pronounced movements, impacting surgical planning.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Excimer laser ablation is a key procedure in refractive surgery.
  • Femtosecond laser-assisted in situ keratomileusis (FS-LASIK) offers precision but is sensitive to patient eye movements.
  • Understanding eye movement dynamics is crucial for optimizing surgical outcomes.

Purpose of the Study:

  • To analyze eye movement dynamics during FS-LASIK.
  • To compare movement patterns between the first (right) and second (left) operated eyes.
  • To investigate direction, magnitude, and temporal changes in eye movements.

Main Methods:

  • Retrospective analysis of 92 eyes from 46 patients undergoing FS-LASIK.
  • Utilized the SCHWIND AMARIS system for laser ablation.
  • Collected and analyzed eye-tracking data for horizontal and vertical movements, variability, and temporal trends.

Main Results:

  • Vertical eye movements demonstrated significantly greater variability than horizontal movements (P=.02 vs P=.79).
  • The second eye exhibited increased variability, particularly vertically, with earlier and more dynamic changes (r=0.20, P<.0005).
  • Vertical movements increased significantly after 13 seconds (right eye) and 5 seconds (left eye).

Conclusions:

  • Eye movements during FS-LASIK are dynamically variable, with a notable emphasis on vertical motion.
  • The second eye's surgical progression is associated with earlier and more pronounced eye movements.
  • Findings underscore the importance of incorporating eye movement dynamics into surgical planning and laser system design.