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Comparative Study
. 2018 Nov;66(11):1558-1561.
doi: 10.4103/ijo.IJO_507_18.

Comparative analysis of visual outcomes and ocular aberrations following wavefront optimized and topography-guided customized femtosecond laser in situ keratomileusis for myopia and myopic astigmatism: A contralateral eye study

Nitin N Tiwari  1 , Gitansha S Sachdev  1 , Shreyas Ramamurthy  1 , Ramamurthy Dandapani  1
Affiliations
Comparative Study

Comparative analysis of visual outcomes and ocular aberrations following wavefront optimized and topography-guided customized femtosecond laser in situ keratomileusis for myopia and myopic astigmatism: A contralateral eye study

Nitin N Tiwari et al. Indian J Ophthalmol. 2018 Nov.

Abstract

Purpose: To compare the visual outcomes and higher order aberrations (HOAs) following wavefront optimized (WFO) laser in situ keratomileusis (LASIK) versus topography-guided customized ablation (TCAT) LASIK for myopia and myopic astigmatism.

Methods: Patients who underwent femtosecond-assisted LASIK for myopic correction between August 2016 and October 2017 were included in this interventional prospective case series. The following parameters were evaluated preoperatively and at 3 months' postoperative visit: uncorrected distance vision acuity (UDVA) and corrected distance vision acuity (CDVA), manifest refraction, and HOAs.

Results: Two hundred eyes of 100 patients were included in the study. At 3 months' postoperative visit, 92% and 90% eyes in the TCAT and WFO groups, respectively, demonstrated a UDVA of 20/20 or better (P = 0.90). A residual manifest spherical equivalent within 0.5 D was achieved in 100% and 95% of the eyes in the TCAT and WFO groups, respectively (P = 0.10). No significant difference was observed in the HOAs induced in both the groups, with slightly lower induction of trefoil and horizontal coma in the TCAT group.

Conclusion: Both groups demonstrated similar refractive efficacy and predictability, with greater gain of CDVA following TCAT ablation. HOAs induced were not significantly different between the two groups. Further studies are needed to validate the superiority of one procedure over the other.

Keywords: higher order aberrations; laser in situ keratomileusis; topography-guided customized ablation; wavefront optimized ablation.

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Conflict of interest statement

There are no conflicts of interest

Figures

Figure 1
Figure 1
Percentage of eyes that achieved uncorrected visual acuity of 20/20 and better in the (a) TCAT and (b) WFO groups
Figure 2
Figure 2
The number of lines lost and gained in the TCAT and WFO groups
Figure 3
Figure 3
Attempted versus achieved SEQ in the form of a scatter plot in the (a) TCAT and (b) WFO ablation groups
Figure 4
Figure 4
SEQ refractive accuracy in terms of number of eyes that were within ±0.50 diopters (D) of the attempted correction in the TCAT and WFO groups
See this image and copyright information in PMC

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