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Chapter-103 LASIK Outcomes in Astigmatism

BOOK TITLE: Copeland and Afshari's Principles and Practice of Cornea (2 Volumes)

Author
1. Berdahl John P
2. DeStafeno John J
ISBN
9789350901724
DOI
10.5005/jp/books/11777_103
Edition
1/e
Publishing Year
2013
Pages
8
Author Affiliations
1. 710 E 24th St. Suite 100, Minneapolis, MN 55404=3810, Vance Thompson Vision; Sanford University of South Dakota, School of Medicine, Sioux Falls, South Dakota, USA, Sanford University of South Dakota, School of Medicine, Sioux Falls, South Dakota, USA, Vance Thompson Vision, Sioux Falls, SD, USA
2. Chester County Eye Care Associates, West Chester, Pennsylvania, USA, West Chester, Pennsylvania, USA
Chapter keywords
Astigmatism, lenticular curvature, keratotomy procedures, excimer laser, laser in situ keratomileusis, penetrating keratoplasty, toric and phakic intraocular lens, myopic astigmatic corrections, spherocylindrical error

Abstract

Astigmatism is a common refractive error, due to corneal or lenticular curvature meridional differences, in which light rays entering the eye do not focus into a single point resulting in a blurred visual image. Astigmatism can be managed with several modalities including spectacles, contact lenses, toric and phakic intraocular lenses, and varying forms of excimer laser ablation. This chapter mainly describes excimer laser corrective surgery specifically laser in situ keratomileusis (LASIK) used for the treatment of astigmatism with its visual outcomes. Irregular astigmatism are classified into two distinct types i.e. regularly irregular and irregularly irregular astigmatism. Regularly irregular astigmatism has an identifiable pattern while irregularly irregular astigmatism has no recognizable pattern on corneal topography. LASIK refractive surgery is a well-established and proven technology for astigmatism correction. Excimer lasers correct spherocylindrical error using an ablation profile and are commonly referred as conventional LASIK. LASIK after penetrating keratoplasty and LASIK compared to phakic toric implanted collamer lens are also discussed.

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