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KMID : 0372919990200010045
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Journal of Biomedical Engineering Research
1999 Volume.20 No. 1 p.45 ~ p.51
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The Investigation and Development of Astigmatism Correction Treatments by Finite Element Method and Animal Experiments
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Shin Jeong-Uk
Lee Seong-Jae
Han Tae-Won
Kim Su-Hyang
Kim Jae-Ho
Park Hyo-Sun
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Abstract
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The purpose of this study is to investigate the effects of various factors in keratotomy for astigmatism correction on surgical outcomes by finite element method as well as animal experiments. Three kinds of surgical techniques were mechanically investigated : arcuate, straight, and inverse arcuate keratotomy. Among the three techniques the arcuate keratotomy is the most popular one while the other two techniques are being investigated in this area. The arcuate keratotomy was found to be more controllable and effective in reducing the refractive power than the others. In arcuate keratotomy it was found most effective when the incision was located in the middle position between the apex and the edge of the cornea from the results of experiment as well as finite element study. Regarding to the range of the corneal incision in arcuate keratotomy, the incision angle of 90 was found th be most effective in reducing refractive power than other angles even it was incised up to 150. Therefore, it was concluded that 90 of incision angle results in the largest decrease in refractive power in arcuate keratotomy. However, other important findings were that the effect of the surgery decreased with time so the visco-effect of the cornea and auto-healing process. Therefore, these factors should be considered in future studies.
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KEYWORD
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Keratotomy, Cornea, Finite element method
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