Corneal topographic evaluation of decentration in photorefractive keratectomy: treatment displacement vs intraoperative drift

American Journal of Ophthalmology
D T Azar, P C Yeh

Abstract

To evaluate treatment displacement and movement during treatment (drift) after excimer laser photorefractive keratectomy using tangential topographic maps. Forty-eight eyes of 48 patients showing axial decentration of 0.30 mm or more at 1 month posttreatment were reevaluated retrospectively to determine treatment displacement of the center of the photorefractive keratectomy ablation from the center of the pupil. A drift index was calculated to determine the relative degree of movement (drift) during treatment. We subdivided patients into four groups based on the degree of treatment displacement and drift and compared the mean axial decentration and the mean best-corrected logMAR visual acuity among the subgroups. Mean treatment displacement +/- SD from the center of the entrance pupil was 0.34 +/- 0.21 mm. Thirty-eight eyes (79.2%) had ablations within 0.50 mm from the center of the entrance pupil. We observed downward displacement in 27 eyes (56.2%) and upward displacement in 21 eyes (43.8%). The drift index showed a positive, statistically significant correlation with best-corrected visual acuity (r = .58, P < .0001). Patients with low displacement and low drift had mean logMAR best-corrected visual acuity of 0.91, which was ...Continue Reading

References

Jul 1, 1992·Journal of Cataract and Refractive Surgery·A M FayJ A Myers
Aug 1, 1992·Ophthalmology·D S GartryJ Marshall
Nov 1, 1994·Journal of Cataract and Refractive Surgery·S AmanoK Shimizu
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Citations

Feb 23, 2000·Journal of Cataract and Refractive Surgery·Y SakaryaS S Ermip
Mar 22, 2003·Journal of Cataract and Refractive Surgery·Michael BueelerTheo Seiler
Mar 24, 2009·Journal of Cataract and Refractive Surgery·Prema PadmanabhanSubam Basuthkar
Nov 14, 2002·American Journal of Ophthalmology·Rafael L Ufret-VincentyDimitri T Azar
Sep 30, 2010·Ophthalmic Surgery, Lasers & Imaging : the Official Journal of the International Society for Imaging in the Eye·Hasan Basri CakmakSaban Simsek
Nov 15, 2005·Eye & Contact Lens·Loretta Szczotka-Flynn, Binoy R Jani
Feb 18, 2004·Journal of Cataract and Refractive Surgery·Michael BueelerTheo Seiler
Jul 26, 2003·International Ophthalmology Clinics·José L Güell, Fortino Velasco
Jul 26, 2003·International Ophthalmology Clinics·Elias F Jarade, Dimitri T Azar
Aug 15, 2000·International Ophthalmology Clinics·C G EshbaughR R Krueger
May 22, 2003·Seminars in Ophthalmology·Kenichiro BesshoYasuo Tano
Mar 14, 2000·Journal of Cataract and Refractive Surgery·J Schwiegerling, R W Snyder
Jul 16, 2019·Survey of Ophthalmology·Ritu NagpalNamrata Sharma
Oct 2, 2001·Survey of Ophthalmology·S A Melki, D T Azar

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