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Centration error spurs more aberrations than cyclotorsion misalignment in LASIK, PRK

J Cataract Refract Surg. 2008;34(12):2057-2062.

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Centration error produced greater residual wavefront aberrations than cyclotorsional misalignment during wavefront-guided LASIK and PRK.

The retrospective study included 58 eyes of 38 patients who had a mean age of 35 years and underwent wavefront-guided LASIK or PRK with the Star S4 excimer laser with iris registration (Advanced Medical Optics). Wavefront aberrations were measured with the WaveScan aberrometer (AMO).

Compared with cyclotorsional misalignment, centration error caused 4.9 times more total aberrations, 2.8 times more lower-order aberrations and 8.7 times more higher-order aberrations. Overall, differences in values were statistically significant (P < .05).

"The finding of greater visual impact induced by centration error than by cyclotorsional misalignment can be explained by the fact that centration error produced aberrations in Zernike terms in the center of the Zernike tree, whereas cyclotorsional misalignment produces aberrations in Zernike terms in the edge," the study authors said.