J Korean Ophthalmol Soc.  2018 Jun;59(6):505-510. 10.3341/jkos.2018.59.6.505.

Effect of the Corneal Incision Direction Using an Image-guided System on Residual Astigmatism

• Jeon SH
• Park CH
• Kim HS

• KMID: 2413812
• DOI: http://doi.org/10.3341/jkos.2018.59.6.505

Abstract

PURPOSE
We evaluated the effect of corneal incision direction using an image-guided system on cataract surgery.
METHODS
We retrospectively reviewed patients who underwent cataract surgery at The Catholic University of Korea Yeouido St. Mary's Hospital. The patients were divided into two groups. In group 1 (20 eyes), the corneal incision was made along the steepest axis using the VERION image-guided system (Alcon, Fort Worth, TX, USA). In the control group, group 2 (20 eyes), the incision was made at the vertical or horizontal axis closest to the patient's steepest axis. We compared residual astigmatism and the mean difference in astigmatism before and after cataract surgery between the two groups using an autorefractor keratometer (RK-F1®; Canon, Tokyo, Japan) and a Pentacam system (Oculus, Wetzlar, Germany).
RESULTS
Group 1's residual astigmatism was significantly lower than that of group 2 ([VERION group 1; before, 0.89 ± 0.58 D; after, 0.84 ± 0.51 D; p = 0.049] and [control group 2; before, 1.38 ± 0.62 D; after, 1.24 ± 0.62 D; p = 0.043]). The mean difference in astigmatism before and after cataract surgery for group 1 was also larger than group 2 ([VERION group 1; before, 0.71 ± 0.81 D; after, 0.61 ± 0.69 D; p = 0.034] and [control group 2; before, 0.61 ± 0.69 D; after, 0.43 ± 0.61 D; p = 0.048]).
CONCLUSIONS
Using an image-guided system, postoperative residual astigmatism from cataract surgery can be minimized using an incision direction that is aligned with the corneal astigmatic axis.

Keyword

Astigmatism; Cataract; Image-guided system

MeSH Terms

Astigmatism*
Cataract
Humans
Korea
Retrospective Studies

Figure

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  Figure 1. Mean difference astigmatism between preoperative and postoperative data. (A) The mean difference of astigmatism was statistically significantly higher in group 1 than in group 2 when measured with autorefractor keratometer. (B) The mean difference of astigmatism was statistically significantly higher in group 1 than in group 2 when measured with pentacam. Preop = preoperative; m = months.

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  Figure 2. Preoperative and postoperative visual acuity (logMAR) between 2 groups. Both group showed improvement in visual acuity after surgery, but the difference between the two groups was not statistically significant. UCVA = uncorrected visual acuity; Preop = preoperative; POD = postoperative day; m = months.

Reference

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