Laser induced scleral shrinkage for refractive surgery

Qiushi Ren, Gabriel Simon, Jean Marie Parel, Jin Hui Shen

Research output: Contribution to journalConference article

Abstract

Purpose: To investigate the laser refractive scleroplasty (LRS) as a potential minimal-invasive method for correcting post-operative astigmatism. Methods: The scleral shrinkage near limbus was induced on 6 cadaver eyes using a 200 μm fiber optic probe coupled to a pulsed Ho: YAG laser (wavelength = 2.1 μm, pulse duration = 0.3 ms, repetition rate = 5 Hz). The diameter of the treatment spot was 0.8 mm. The output energy measured at tip was 60.2±0.6 mJ. The treatments consisted of multiple sector patterns placed along the major axis of astigmatism parallel to from the limbus, and round patterns placed along the limbus. Three treatment spots (2 mm apart) were applied on each side of the sector. The separation among sectors and limbus is 1 mm. Keratometry and topography of the cornea were measured after each sector or round pattern treatment. Effect of 5 and 10 pulses at each treatment spot were compared. Histology was performed to evaluate laser tissue damage. Results: The major axis of astigmatism was shifted 90° after the sector pattern treatment and amount of dioptric change increased when adding a new treatment or using more treatment pulses. However, the spherical equivalent of the eyes was essentially unchanged. The keratometry of the corneas remained the same after the round pattern treatment. Conclusion: Laser refractive scleroplasty may be applied for the correction of postoperative astigmatism.

Original languageEnglish (US)
Pages (from-to)34-39
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2126
DOIs
StatePublished - Jun 23 1994
EventOphthalmic Technologies IV 1994 - Los Angeles, United States
Duration: Jan 23 1994Jan 29 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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