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. 2013 Aug 18;6(4):498-504.
doi: 10.3980/j.issn.2222-3959.2013.04.17. eCollection 2013.

Visual performance after conventional LASIK and wavefront-guided LASIK with iris-registration: results at 1 year

Jing Zhang  1 , Yue-Hua Zhou, Rui Li, Lei Tian
Affiliations

Visual performance after conventional LASIK and wavefront-guided LASIK with iris-registration: results at 1 year

Jing Zhang et al. Int J Ophthalmol. .

Abstract

Aim: To compare visual performance of wavefront-guided laser in situ keratomileusis (LASIK) with iris-registration (Wg-LASIK group) and conventional LASIK (LASIK group) one year after surgery and analyze the correlation between wavefront aberrations and visual performance.

Methods: Eight hundred and fifty-two myopic eyes of 430 patients were enrolled in this prospective study and divided into two groups: Wg-LASIK group (436 eyes) and LASIK group (416 eyes). A Wavescan Wavefront aberrometer was used to analyze Zernike coefficients and the root-mean-square (RMS) of higher order aberrations, and Optec 6500 visual function instrument was used to measure contrast sensitivity (CS) before and 3, 6, 12 months after surgery.

Results: The mean spherical equivalent (SE) in Wg-LASIK group was significantly better than those in LASIK group one year after surgery (P=0.024). Wg-LASIK eyes showed better CS values than LASIK eyes at all spatial frequencies with and without glare after surgery (P all<0.01). Moreover, the increase of higher RMS (RMSh), coma, RMS3, RMS4, RMS5 in Wg-LASIK group were significantly lower than those in LASIK group 1 year after surgery (P all<0.05). The increase of coma, spherical aberration (SA), RMS3 and RMS4 in Wg-LASIK and coma and RMS3 in LASIK group were negatively correlated with reduction of contrast sensitivity 1 year after surgery.

Conclusion: A significant better visual performance is got in Wg-LASIK group compared with LASIK group 1 year after surgery, and the Wg-LASIK is particularly suitable for eyes with high-magnitude RMSh.

Keywords: aberration; contrast sensitivity; laser in situ keratomileusis; visual performance.

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Figures

Figure 1
Figure 1. Changes in best spectacle corrected visual acuity (BSCVA) 3, 6 and 12 months after surgery in Wg-LASIK group and conventional LASIK.
Figure 2
Figure 2. Preoperative contrast sensitivity (CS) for Wg-LASIK and conventional LASIK
A: Preoperative CS without glare; B: Preoperative CS with glare. Analyzed by Independent-Samples t-test.
Figure 3
Figure 3. Postoperative contrast sensitivity(CS) for Wg-LASIK and conventional LASIK
A: 3-month CS without glare; B: 3-month CS with glare; C: 6-month CS without glare; D: 6-month CS with glare; E: 1-year CS without glare; F: 1-year CS with glare. Analyzed by Independent-samples t-test. aP<0.05.
Figure 4
Figure 4. Correlation between induced changes in RMSh and preoperative RMSh
A: Wavefront-guided LASIK group; B: Conventional LASIK group.
See this image and copyright information in PMC

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