Analysis of the Factors Affecting Decentration in Photorefractive Keratectomy and Laser In Situ Keratomileusis for Myopia

Jae Bum Lee, Jae In Jung, Young Kwang Chu, Jong Hyuck Lee, Eungkweon Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

To evaluate the relationship between ablation zone decentration measured by corneal topography and various factors such as sex, age, order of operation, preoperative sedative prescription, ablation diameter and depth, type of procedure (photorefractive keratectomy=PRK, laser in situ keratomileusis=LASIK), and the use of a passive eye tracker, we examined the data of 80 eyes in 50 patients. The patients received PRK (43 eyes in 30 patients) or LASIK (37 eyes in 20 patients), and were followed for 3 months postoperatively. Statistical analysis of the data was performed using t-test, ANOVA and multiple regression analysis. The overall average ablation decentration from the pupil center was 0.43 ± 0.27 mm, 0.35 ± 0.22 mm in PRK and 0.47 ± 0.30 mm in LASIK. Overall 91.3% of patients were decentered less than 0.75 mm and 95.0% were decentered less than 1.00 mm, while 93.9% of patients were decentered less than 0.75 mm in PRK and 88.7% were decentered less than 0.75 mm in LASIK. The most meridional displacement was toward the superonasal quadrant; 46% in PRK and 51% in LASIK. There was less decentration in males, in the 2nd-operated eye, in older age, PRK, in larger ablation diameter, and in shallower ablation depth, but these differences were not statistically significant.

Original languageEnglish
Pages (from-to)221-225
Number of pages5
JournalYonsei medical journal
Volume40
Issue number3
DOIs
Publication statusPublished - 1999 Jan 1

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Photorefractive Keratectomy
Laser In Situ Keratomileusis
Myopia
Statistical Factor Analysis
Corneal Topography
Statistical Data Interpretation
Pupil
Hypnotics and Sedatives
Prescriptions
Analysis of Variance
Regression Analysis

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Lee, Jae Bum ; Jung, Jae In ; Chu, Young Kwang ; Lee, Jong Hyuck ; Kim, Eungkweon. / Analysis of the Factors Affecting Decentration in Photorefractive Keratectomy and Laser In Situ Keratomileusis for Myopia. In: Yonsei medical journal. 1999 ; Vol. 40, No. 3. pp. 221-225.
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Analysis of the Factors Affecting Decentration in Photorefractive Keratectomy and Laser In Situ Keratomileusis for Myopia. / Lee, Jae Bum; Jung, Jae In; Chu, Young Kwang; Lee, Jong Hyuck; Kim, Eungkweon.

In: Yonsei medical journal, Vol. 40, No. 3, 01.01.1999, p. 221-225.

Research output: Contribution to journalArticle

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