Laser in situ keratomileusis enhancement for correcting residual refractive error

Authors

  • Yong Li Department of Ophthalmology, Beijing Hospital, Beijing, China.
  • Guy Chan Department of Ophthalmology, Hong Kong Sanatorium & Hospital, Happy Valley, Hong Kong, China.
  • Walton Li Department of Ophthalmology, Hong Kong Sanatorium & Hospital, Happy Valley, Hong Kong, China.
  • John Chang Department of Ophthalmology, Hong Kong Sanatorium & Hospital, Happy Valley, Hong Kong, China.
  • Ngan Chen Department of Ophthalmology, Hong Kong Sanatorium & Hospital, Happy Valley, Hong Kong, China.
  • Patrick Tong Department of Ophthalmology, Hong Kong Sanatorium & Hospital, Happy Valley, Hong Kong, China.
  • Qun Cao Department of Ophthalmology, Beijing Hospital, Beijing, China.

Abstract

Aim: To study the results of laser in situ keratomileusis (LASIK) enhancement for residual refractive error.

Patients and methods: 121 eyes of 101 patients had LASIK enhancement done after a previous LASIK procedure. The average time after initial surgery was 121.2 ± 56.2 days (range, 83 to 433 days). The patients were divided into 4 groups according to their refraction: group I, -1.0 to -5.0 D (4 eyes); group II, -5.1 to -10.0 D (57 eyes); group III, -10.1 to -15.0 D (44 eyes); and group IV, >15.0 D (16 eyes). The mean pre-LASIK spherical equivalent of each group was: group I, -3.70 ± 1.01 D (range, -2.50 to -4.63 D); group II, -7.82 ± 1.47 D (range, -5.13 to -9.88 D); group III, -12.20 ± 1.44 D (range, -10.13 to -14.88 D); and group IV, -20.60 ± 3.40 D (range, -15.25 to -27.50 D). The mean pre-LASIK enhancement spherical equivalent of each groups was: group I, +0.97 ± 0.89 D (range, -0.13 to +2.00 D); group II, -1.15 ± 1.22 D (range, -4.63 to +2.13 D); group III, -2.22 ± 0.99 D (range, -3.88 to -0.50D); and group IV, -6.62 ± 3.52 D (range, -11.88 to +0.25 D). The spectacle corrected visual acuity before the first laser in situ keratomileusis was 20/40 or better for 111 eyes (92%), apart from 6 eyes in group III and 4 eyes in group IV. Patients were followed at 1 day, 1 week, 1 month, 3 months, 6 months, and 12 months.

Results: Eighty five eyes (71%) were followed up at 3 months and 12 months, and 79 eyes (65.3%) at 6 months after LASIK enhancement. The mean spherical equivalent at 3 months for group I was +0.440 ± 0.800D (range, -0.125 to +1.000 D); for group II, -1.170 ± 0.880 D (range, -2.875 to +0.875 D); for group III, -1.120 ± 1.450 D (range, -3.750 to +2.000D); and for group IV, -3.630 ± 3.330 D (range, -11.000 to +0.250 D). At 12 months, the mean spherical equivalent was + 0.310 ± 0.440 D (range, 0 to + 0.625 D) for group I; -0.200 ± 1.030 D (range, –2.750 to +2.250 D) for group II; -0.550 ± 1.040 D (range, -4.375 to +1.250 D) for group III; and -1.950 ± 2.130 D (range, -7.000 to +0.500 D) for group IV. The post-LASIK enhancement uncorrected visual acuity improved in 110 eyes (91%), reduced 1 line in 2 eyes, 2 lines in 2 eyes, and no change in 7 eyes. Among the 85 eyes followed up at 12 months, 66 eyes (78%) had uncorrected visual acuity of 20/40 or better. At 12 months follow-up, no eye had spectacle corrected visual acuity of less than 20/40.

Conclusions: Laser in situ keratomileusis enhancement is effective in reducing the residual refractive error and improving the uncorrected visual acuity after laser in situ keratomileusis.

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Published

2003-12-01

How to Cite

1.
Li Y, Chan G, Li W, Chang J, Chen N, Tong P, Cao Q. Laser in situ keratomileusis enhancement for correcting residual refractive error. Hong Kong J Ophthalmol [Internet]. 2003Dec.1 [cited 2022May28];7(1):19-22. Available from: https://hkjo.hk/index.php/hkjo/article/view/101

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Original Articles