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Laser in situ keratomileusis nomogram development.

K Ditzen1, A Handzel, S Pieger

  • 1Eye Surgery Center Weinheim, Germany.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|April 15, 1999
PubMed
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Developing a standard laser in situ keratomileusis (LASIK) nomogram for the Nidek EC-5000 excimer laser is crucial. This study found that a 20% reduction in attempted spherical correction is needed for optical zones 6mm and above to avoid overcorrection.

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Laser Vision Correction

Background:

  • Current Nidek EC-5000 excimer laser software (versions 2.23/2.25) lacks a standardized nomogram.
  • Existing nomograms vary significantly among users, leading to inconsistent outcomes.

Purpose of the Study:

  • To analyze LASIK outcomes using the Nidek EC-5000 excimer laser.
  • To develop a more accurate nomogram by comparing attempted vs. achieved refractive changes.
  • To identify factors influencing refractive outcomes, such as optical zone size and patient age.

Main Methods:

  • Analysis of 138 eyes treated for myopia and myopic astigmatism with the Nidek EC-5000 excimer laser.
  • Comparison of laser correction values with achieved refractive changes.
  • Development of a nomogram parameter incorporating optical zone size and patient age.

Related Experiment Videos

  • Implementation of a 20% reduction in attempted spherical correction due to observed overcorrections.

    • Main Results:

    • Mean attempted spherical equivalent refraction was -6.85 D.
    • Postoperative visual acuity was comparable to published studies.
    • A consistent 20% trend toward overcorrection was observed, increasing with patient age and optical zone diameter.

    Conclusions:

    • Factory standard calibration values for Nidek EC-5000 software versions 2.23/2.25 are too aggressive.
    • A minimum 20% reduction in spherical correction is recommended for optical zones 6mm and larger.
    • LASIK nomograms for this laser should be tailored to optical zone diameter and patient age.