Steep Axis Incision Versus Temporal Incision in Microcoaxial Cataract Surgery.
10.3341/jkos.2011.52.1.29
- Author:
Woong Joo WHANG
1
;
Yong Soo BYUN
;
Choun Ki JOO
Author Information
1. Department of Ophthalmology, Seoul St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea. ckjoo@catholic.ac.kr
- Publication Type:Original Article ; Randomized Controlled Trial
- Keywords:
Clear corneal incision;
Microcoaxial cataract surgery;
Steep axis incision;
Surgically-induced astigmatism
- MeSH:
Astigmatism;
Cataract;
Corneal Topography;
Eye;
Humans;
Phacoemulsification;
Prospective Studies
- From:Journal of the Korean Ophthalmological Society
2011;52(1):29-33
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To determine if a difference exists in surgically-induced astigmatism (SIA) and the mean change in keratometric astigmatism in patients who underwent microcoaxial cataract surgery (MCCS). METHODS: A prospective study including 193 eyes with astigmatism of greater than 0.5 diopters was performed. The eyes were randomized into two groups: (1) 95 eyes with steep axis incision, and (2) 98 eyes with temporal incision. A 2.2-mm microcoaxial phacoemulsification was performed. The UCVA, BCVA and corneal topography (Orbscan II, Bausch & Lomb) were measured preoperatively and three months postoperatively. Surgically induced astigmatism was calculated via vector analysis, and the mean change in keratometric astigmatism was also calculated. RESULTS: There were no significant differences in UCVA or BCVA between the two groups three months postoperative. The mean SIA was 0.45 +/- 0.27 diopters in the steep axis incision group and 0.30 +/- 0.17 diopters in the temporal incision group. In the steep axis incision group, the mean keratometric astigmatism showed a mean reduction of 0.31 +/- 0.37 diopter (WTR: 0.37 D; oblique: 0.35D; ATR: 0.16 D), while the mean keratometric astigmatism showed a mean increase of 0.06 +/- 0.29 diopters (WTR: 0.15 D increased; oblique: 0.11 D increased; ATR: 0.13 D reduced) in the temporal incision group. There were statistically significant differences in SIA and change in astigmatism between the two groups (p = 0.002, p = 0.000). CONCLUSIONS: In MCCS, steep axis incision achieved superior astigmatism correction in patients having with-the-rule or oblique astigmatism of greater than 0.5 diopters.
