| The Changes of Refractive Error and Corneal Astigmatism after Horizontal Strabismus Surgery. |
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Jeong Hee Lee, Dong Gyu Choi |
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Department of Ophthalmology, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul, Korea. |
| 수평사시 수술후 굴절상태 및 각막난시의 변화 |
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이정희(Jeong Hee Lee),최동규(Dong Gyu Choi) |
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| Abstract |
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We performed a prospective study of evaluating preoperative and postoperative refractive error and corneal curvature in cycloplegic refraction and keratometry in 25 eyes of 25 patients undergoing horizontal recession and resection procedure. At 4 months after operation, the change of refractive error by cycloplegic refraction was +0.12D in average in horizontal meridian, which was a significant shift toward 'with-the-rule astigmatism' direction(p<0.05), whereas there was little change in vertical meridian(p>0.05). In horizontal meridian, the with-the-rule astigmatic changes of +0.5D or more were present in 7 eyes(28%) and the against-the-rule astigmatic changes of -0.5D or more were present only in 2 eyes(8%). In vertical meridian, we found that 3 eyes(12%) had the changes of +0.5D or more and 6 eyes(24%) had the changes of -0.5D or more. The change of corneal curvature in keratometry amounted to average -0.50D in horizontal meridian(that means the flattening of cornea)(p<0.05) and 0.19D in vertical meridian (that means the steepening of cornea) (p>0.05) at postoperative 4 months, showing the results similar to those of cycloplegic refraction. Futhermore, the astigmatic change by cycloplegic refraction and keratometry at postoperative 2 weeks and 1 month were similar to those at postoperative 4 months. These data suggest that there may be significant changes in astigmatism(more commonly in with-the-rule astigmatism) after strabismus surgery, and this astigmatic change appears due to the corneal change resulting from the variation in the force that the muscles exert on the globe. |
| Key Words:
Cycloplegic refraction;Horizontal recession-resection procedure;Keratometry;With-the-rule astigmatism |
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