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Clinical Trial
. 2017:2017:9391436.
doi: 10.1155/2017/9391436. Epub 2017 May 17.

Twelve-Year Follow-Up of Laser In Situ Keratomileusis for Moderate to High Myopia

Tetsuya Ikeda  1 , Kimiya Shimizu  1 , Akihito Igarashi  1 , Sumie Kasahara  1 , Kazutaka Kamiya  1
Affiliations
Clinical Trial

Twelve-Year Follow-Up of Laser In Situ Keratomileusis for Moderate to High Myopia

Tetsuya Ikeda et al. Biomed Res Int. 2017.

Abstract

Purpose: To assess the long-term clinical outcomes of conventional laser in situ keratomileusis (LASIK) for moderate to high myopia.

Methods: We retrospectively examined sixty-eight eyes of 37 consecutive patients who underwent conventional LASIK for the correction of myopia (-3.00 to -12.75 diopters (D)). At 3 months and 1, 4, 8, and 12 years postoperatively, we assessed the safety, efficacy, predictability, stability, mean keratometry, central corneal thickness, and adverse events.

Results: The safety and efficacy indices were 0.82 ± 0.29 and 0.67 ± 0.37, respectively, 12 years postoperatively. At 12 years, 53% and 75% of the eyes were within 0.5 and 1.0 D, respectively, of the targeted correction. Manifest refraction changes of -0.74 ± 0.99 D occurred from 3 months to 12 years after LASIK (p < 0.001). We found a significant correlation of refractive regression with the changes in keratometric readings from 3 months to 12 years postoperatively (Pearson correlation coefficient, r = -0.28, p = 0.02), but not with the changes in central corneal thickness (r = -0.08, p = 0.63). No vision-threatening complications occurred in any case.

Conclusions: Conventional LASIK offered good safety outcomes during the 12-year observation period. However, the efficacy and the predictability gradually decreased with time owing to myopic regression in relation to corneal steepening.

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Figures

Figure 1
Figure 1
Changes in corrected distance visual acuity (CDVA) 12 years after laser in situ keratomileusis (LASIK). Group 1 is low to moderate myopia group and Group 2 is high myopia group.
Figure 2
Figure 2
Cumulative percentages of eyes attaining uncorrected distance visual acuity (UDVA) of 20/20 or more 12 years after laser in situ keratomileusis (LASIK). Group 1 is low to moderate myopia group and Group 2 is high myopia group.
Figure 3
Figure 3
Percentages of eyes within ±1.0 D of the attempted (spherical equivalent) correction after laser in situ keratomileusis (LASIK). Group 1 is low to moderate myopia group and Group 2 is high myopia group.
Figure 4
Figure 4
A scatter plot of the attempted versus the achieved manifest spherical equivalent correction 12 years after laser in situ keratomileusis (LASIK). Group 1 is low to moderate myopia group and Group 2 is high myopia group.
Figure 5
Figure 5
Time course of manifest spherical equivalent after laser in situ keratomileusis (LASIK). Group 1 is low to moderate myopia group and Group 2 is high myopia group.
Figure 6
Figure 6
A graph showing a significant correlation between the change in mean keratometric readings and the changes in spherical equivalent from 3 month to 12 years after laser in situ keratomileusis (LASIK). Group 1 is low to moderate myopia group and Group 2 is high myopia group.
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