Laser-induced scleral shrinkage for refractive surgery

Qiushi Ren; Gabriel Simon; Jean-Marie A. Parel; Jin-Hui Shen

doi:10.1117/12.178585

23 June 1994 Laser-induced scleral shrinkage for refractive surgery

Qiushi Ren, Gabriel Simon, Jean-Marie A. Parel, Jin-Hui Shen

Proceedings Volume 2126, Ophthalmic Technologies IV; (1994) https://doi.org/10.1117/12.178585
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We investigate the laser refractive scleroplasty (LRS) as a potential minimal-invasive method for correcting post-operative astigmatism. The scleral shrinkage near limbus was induced on 6 cadaver eyes using a 200 micrometers fiber optic probe coupled to a pulsed Ho:YAG laser. 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 the limbus, and round patterns placed along the limbus. Three treatment spots 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. The major axis of astigmatism was shifted 90 degrees 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. Laser refractive scleroplasty may be applied for the correction of post-operative astigmatism.

Citation Download Citation

Qiushi Ren, Gabriel Simon, Jean-Marie A. Parel, and Jin-Hui Shen "Laser-induced scleral shrinkage for refractive surgery", Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); https://doi.org/10.1117/12.178585

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