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Related Experiment Videos

Automatic eye tracker for excimer laser photorefractive keratectomy

P G Gobbi1, F Carones, R Brancato

  • 1Laser Medicine Research, Scientific Institute S. Raffaele Hospital, University of Milan, Italy.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|May 1, 1995
PubMed
Summary

This study introduces an eye-tracker for photorefractive keratectomy (PRK) to precisely control laser pulses during eye surgery. The system compensates for eye movements, enhancing surgical accuracy and preventing visual distortions.

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Area of Science:

  • Ophthalmology
  • Medical Engineering
  • Laser Surgery

Background:

  • Accurate laser pulse application is crucial in photorefractive keratectomy (PRK) to prevent refractive errors.
  • Existing excimer laser systems often lack patient eye movement tracking, compromising corneal ablation precision.
  • Patient eye movements can lead to significant distortions during corneal ablation procedures.

Purpose of the Study:

  • To develop and evaluate an automated eye-tracker system for compensating patient eye movements during PRK.
  • To enhance the precision and safety of corneal ablation by ensuring accurate laser pulse delivery.
  • To integrate an eye-tracking system with the ExciMed UV200 ArF excimer laser workstation.

Main Methods:

  • Development of an eye-tracker utilizing television monitoring of the pupil and electro-mechanical deflection of a laser turning mirror.

Related Experiment Videos

  • Integration of a black and white CCD camera and fast stepping motors for pupil tracking.
  • Specific design of circuitry for target discrimination and tracking, and an optical imaging system compatible with the laser beam path.

    • Main Results:

    • Successful pupil tracking achieved across various iris colors with sub-millimeter accuracy (better than 0.1 mm) within a 6 x 6 mm2 field.
    • The system demonstrated a rapid response time of less than 100 ms.
    • Tracking ablations were successfully performed on artificial eyes with moving corneas, validating the system's effectiveness.

    Conclusions:

    • The developed eye-tracker system reliably compensates for patient eye movements during PRK.
    • This automated system offers a significant improvement in precision and effectiveness for corneal ablation procedures.
    • The technology has the potential to reduce refractive distortions and improve outcomes in PRK surgery.