Comparison of Corneal Centering in Photorefractive Keratectomy

Eungkweon Kim, Jae Woo Jang, Jae Bum Lee, Sung Bum Hong, Young Ghee Lee, Hong Bok Kim

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Abstract

The present study compares three centering methods for excimer laser photorefractive keratectomy (PRK, VISX 20/20™) by analyzing the corneal topography. The subjects were grouped according to three different centering methods used in the procedure: an ablation using a light reflex from the patient's cornea pursued by both eyes of the surgeon (Group 1, n = 49); an ablation using a red light reflex from the patient's cornea pursued by the surgeon's left eye only while the right eye remained closed (Group 2, n = 27); an ablation using the patient's center of the pupil pursued by the surgeon's left eye only while the right eye remained closed (Group 3, n = 21). The mean distance from the center of ablation zone to the center of the pupil were; 0.69 ± 0.45 mm for Group 1, 1.05 ± 0.48 mm for Group 2 and 0.63 ± 0.28 mm for Group 3. The degree of deviation in Group 2 was significantly greater than in Group 1 or Group 3. The deviation was greater in the right eyes than the left eyes in Group 2 only. The decentration of the right eye in Group 2 was due to angle Kappa with misalignment of the fixation light and viewing tube containing reticule.

Original languageEnglish
Pages (from-to)317-321
Number of pages5
JournalYonsei Medical Journal
Volume39
Issue number4
DOIs
Publication statusPublished - 1998 Jan 1

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All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Kim, E., Jang, J. W., Lee, J. B., Hong, S. B., Lee, Y. G., & Kim, H. B. (1998). Comparison of Corneal Centering in Photorefractive Keratectomy. Yonsei Medical Journal, 39(4), 317-321. https://doi.org/10.3349/ymj.1998.39.4.317