| The Change in Corneal Astigmatism after Cataract Surgery in Patients with Small Amount of Astigmatism. |
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Hee Jung Yang, Yu Li Park, Hyun Seung Kim |
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Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea. sara514@catholic.ac.kr |
| 경한 난시를 보이는 환자의 백내장 수술 후 각막 후면 및 전체 난시의 변화 |
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양희정⋅박율리⋅김현승 |
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가톨릭대학교 의과대학 여의도성모병원 안과 및 시과학교실 |
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Received: 29 May 2015 • Revised: 29 July 2015 • Accepted: 25 September 2015 |
| Abstract |
PURPOSE
To analyze the change in posterior corneal astigmatism and total corneal astigmatism in patients with anterior corneal astigmatism less than 1.0 diopter (D). METHODS: In the present study we evaluated 52 eyes with anterior corneal astigmatism less than 1.0 D. Patients were divided into 2 groups according to steep axis: Group 1 included 33 eyes with within-the-rule (WTR) astigmatism and Group 2 included 19 eyes with against-the-rule (ATR) astigmatism. Anterior, posterior and total corneal astigmatism were measured using Scheimpflug imaging (Pentacam(R)). RESULTS: In Group 1, preoperative anterior astigmatism, posterior astigmatism and total astigmatism were 0.55 +/- 0.44 D, 0.31 +/- 0.14 D and 0.30 +/- 0.72 D, respectively. At postoperative 2 months, anterior astigmatism, posterior astigmatism and total astigmatism were 0.51 +/- 0.67 D, 0.31 +/- 0.15 D and 0.35 +/- 0.81 D, respectively. There was no statistically significant difference between preoperative and postoperative anterior, posterior and total corneal astigmatism in Group 1. In Group 2, preoperative anterior astigmatism, posterior astigmatism and total astigmatism were -0.48 +/- 0.46 D, 0.26 +/- 0.09 D and -0.51 +/- 0.65 D, respectively. At postoperative 2 months, anterior astigmatism, posterior astigmatism and total astigmatism were -0.17 +/- 0.68 D, 0.25 +/- 0.13 D and -0.30 +/- 0.55 D, respectively. There was no statistically significant difference between preoperative and postoperative anterior, posterior and total corneal astigmatism in the 2 groups. There was no statistical correlation between preoperative posterior corneal astigmatism and postoperative 2 months total corneal astigmatism. After vector analysis, surgically induced astigmatism (SIA) of the anterior and total astigmatism in Group 1 were 0.03 D @ 30degrees and 0.07 D @ 74degrees, respectively, and in Group 2 were 0.27 D @ 100degrees and 0.36 D @ 86degrees, respectively. CONCLUSIONS: In patients with preoperative total corneal astigmatism less than 1.0 D, posterior corneal astigmatism had a small effect on postoperative total corneal astigmatism. |
| Key Words:
Pentacam;Posterior corneal astigmatism;Total corneal astigmatism |
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