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PURPOSE: To investigate the effect of circular keratotomy depth and diameter on corneal astigmatism. METHODS: High astigmatism was induced in 25 human donor eyes by an anterior radial 7-0 silk suture across the corneoscleral limbus. With a 6.0, 6.5, 7.0, or 7.5 mm trephine, a 0.3 mm deep circular incision was made in 20 donor eyes. In 5 donor eyes 5 circular incisions were made with a diamond knife set at 0.1, 0.2, 0.3, 0.4, and 0.5 mm depths. RESULTS: The reduction of astigmatism between the 4 groups in which different trephination diameters were used showed no statistically significant difference (P > .1). The relationship between incision depth and reduction of astigmatism was statistically significant (P < .001). CONCLUSION: Artificially induced corneal astigmatism was reduced by a circular keratotomy in this donor eye model. Deeper incisions showed a greater effect.
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Wijdh et al. (1998) studied this question.
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