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J Cataract Refract Surg. 2011 Jun;37(6):1109-15. doi: 10.1016/j.jcrs.2010.12.058.

Corneal asphericity and spherical aberration after refractive surgery.

Author information

1
Shiley Eye Center, University of California San Diego, La Jolla, California, USA.

Erratum in

  • J Cataract Refract Surg. 2011 Sep;37(9):1742.

Abstract

PURPOSE:

To evaluate changes in corneal asphericity (Q) and spherical aberrations after refractive surgery using Scheimpflug imaging.

SETTING:

University of California, San Diego, Shiley Eye Center, La Jolla, California, USA.

DESIGN:

Cohort study.

METHODS:

After wavefront-guided laser in situ keratomileusis, patients within ± 0.50 diopter of plano and with an uncorrected distance visual acuity of at least 20/20 were evaluated. The Q values and corneal spherical aberration Zernike values were obtained using Scheimpflug imaging preoperatively and 1 to 3 months postoperatively.

RESULTS:

The study enrolled 177 myopic eyes and 32 hyperopic eyes. The mean Q value was -0.28 ± 0.11 (SD) and -0.22 ± 0.15, respectively, preoperatively and +0.35 ± 0.44 and -0.64 ± 0.31, respectively, postoperatively. The asphericity change was highly correlated with preoperative spherical equivalent (r(2) = 0.81; P ≤ .001). The mean corneal spherical aberration was +0.21 ± 0.08 μm in myopic eyes and +0.36 ± 0.11 μm in hyperopic eyes preoperatively and +0.36 ± 0.17 μm and 0.00 ± 0.29 μm, respectively, postoperatively. The corneal spherical aberration changes were correlated with the amount of preoperative refractive error (r(2) = 0.34; P < .001). There was a tendency for Q values and spherical aberrations to become more positive after myopic ablation and more negative after hyperopic ablation.

CONCLUSIONS:

Myopic and hyperopic corrections induced changes in the Q value and spherical aberrations in opposite directions (ie, positive and negative, respectively). The changes depended on the magnitude of the refractive correction.

FINANCIAL DISCLOSURE:

No author has a financial or proprietary interest in any material or method mentioned.

Comment in

PMID:
21596254
DOI:
10.1016/j.jcrs.2010.12.058
[Indexed for MEDLINE]

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