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Related Experiment Videos

Comparison of two microkeratome systems

P S Binder1, M Moore, R W Lambert

  • 1Ophthalmology Research Laboratory, National Vision Research Institute, San Diego, CA 92122, USA.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|March 1, 1997
PubMed
Summary
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The MicroPrecision microkeratome produced smoother corneal resections with more accurate dimensions than the Chiron automated corneal shaper, suggesting instrument design impacts refractive surgery outcomes.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Surgical Technology

Background:

  • Microkeratomes are crucial for refractive surgeries like automated lamellar keratoplasty and LASIK.
  • Reported visual and refractive complications necessitate understanding microkeratome performance.
  • Comparing microkeratome performance can elucidate mechanisms behind refractive surgery complications.

Purpose of the Study:

  • To compare the performance of two microkeratomes: Chiron Automated Corneal Shaper and Eye Technology's MicroPrecision.
  • To evaluate their ability to resect corneal lamellae for refractive surgery.
  • To gain insights into complications following lamellar refractive procedures.

Main Methods:

  • Automated lamellar keratoplasty was simulated on an eyebank eye model to correct 10.00 D myopia.

Related Experiment Videos

  • Key metrics included wet/fixed diameters, excised tissue thickness, and scanning electron microscopy.
  • Ultrasonic pachymetry and a mechanical compression gauge assessed tissue thickness.

    • Main Results:

    • The Chiron automated corneal shaper produced blade chatter, smaller excisions, and variable tissue thickness.
    • The MicroPrecision microkeratome yielded smoother resections without blade marks.
    • MicroPrecision excisions more closely matched intended diameters and thicknesses.

    Conclusions:

    • Microkeratomes differ in their corneal tissue resection morphology.
    • Instrument design, excision mechanics, blade oscillation, and surgical technique influence lamellar keratotomy outcomes.
    • Understanding these differences is key to improving refractive surgery safety and efficacy.