PMID: 9527329Apr 4, 1998Paper

Induced astigmatism after 4 and 6 mm scleral tunnel incision. A randomized study

Acta Ophthalmologica Scandinavica
M Dam-Johansen, T Olsen

Abstract

To study the surgically induced astigmatism after phacoemulsification through either a 4 or a 6 mm scleral tunnel incision by using multiple analyses of astigmatism. 197 eyes from 186 patients scheduled for phacoemulsification between October 1992 and March 1994 were randomly assigned two different-sized incisions with follow-ups at 1 day, 1 week, 2 weeks, 1 month and 4 months after surgery. The surgically induced astigmatism was evaluated using at each follow-up: 1) The subtraction method, 2) vector analysis, 3) vector decomposition, 4) Cravy's vertical vector, 5) Naeser's polar values, and 6) the algebraic method. By subtraction, without regard to axis, the induced astigmatism 4 months after surgery was +0.04 D and +0.18 D in the 4 mm and the 6 mm incision group, respectively. By vector analysis, the numerical value of the induced cylinder was stable one month after surgery at 0.61 D and 0.77 D in the 4 mm and in the 6 mm group, respectively. However, cylinder orientation was not found stable until 4 months after surgery, where 94% and 96% of the surgically induced astigmatism (vector decomposition) was against-the-wound in the two groups, respectively. By Cravy's method, the mean induced astigmatism changed from -0.08 D to -...Continue Reading

References

May 1, 1991·Journal of Cataract and Refractive Surgery·H V Gimbel
Nov 1, 1990·Journal of Cataract and Refractive Surgery·K Naeser
May 1, 1988·Journal of Cataract and Refractive Surgery·S C RichardsK E Crowell
Mar 1, 1987·Journal of Cataract and Refractive Surgery·T Olsen
May 1, 1968·The British Journal of Ophthalmology·E J Naylor
Sep 1, 1994·Journal of Cataract and Refractive Surgery·T Olsen, M Dam-Johansen
Jul 1, 1993·Klinische Monatsblätter für Augenheilkunde·T Seiler, J Wollensak

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Citations

Apr 17, 2008·Acta Ophthalmologica·Kristian Naeser

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