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Corneal astigmatism after scleral buckling surgery assessed by Fourier analysis of videokeratography data
A Tomidokoro1, T Oshika, T Kojima
1Department of Ophthalmology, Omiya Red Cross Hospital, Saitama, Japan. tomidokoro@mse.biglobe.ne.jp
Purpose:
To evaluate quantitatively the changes in corneal curvature, including irregular astigmatism, after scleral buckling surgery for retinal detachment.
Methods:
In 29 eyes of 29 patients undergoing scleral explant surgery, videokeratographic measurements were carried out before and 1 week, 1 month, and 3 months after surgery. Using Fourier harmonic analysis, dioptric data on mire rings were decomposed into spherical, regular astigmatic, and irregular astigmatic (decentration and higher order irregularity) components.
Results:
The irregular astigmatic component significantly increased at 1 week postoperatively but returned to the preoperative level 1 month after surgery. The regular astigmatism also displayed a transient increase up to 1 month after surgery. The increases in regular astigmatism were significant in eyes that had scleral buckling of < or =180 degrees but not in eyes with buckles extending >180 degrees.
Conclusion:
Changes in irregular astigmatism after retinal detachment surgery were quantitatively evaluated. The scleral buckling surgery causes a transient increase in irregular astigmatism as well as regular astigmatism.
