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KMID : 0311119980390040317
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Yonsei Medical Journal
1998 Volume.39 No. 4 p.317 ~ p.321
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Comparison of Corneal Centering in Photorefractive Keratectomy
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Eung Kweon Kim
Jae Woo Jang/Jae Bum Lee/Sung Bum Hong/Young Ghee Lee/Hong Bok Kim
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Abstract
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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.
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KEYWORD
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Centering method, photorefractive keratectomy, topography,
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