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Prospective comparison of single-zone and multizone laser in situ keratomileusis for the correction of low myopia.
- Source :
-
Ophthalmology [Ophthalmology] 1998 Aug; Vol. 105 (8), pp. 1504-11. - Publication Year :
- 1998
-
Abstract
- Objective: This study aimed to determine whether there is a true difference in predictability between single-zone and multizone laser in situ keratomileusis (LASIK) for the correction of low myopia or whether any difference in predictability is because of a need for separate clinical nomograms for the two treatments.<br />Design: A prospective, randomized, clinical trial.<br />Participants: Fourteen surgeons and 190 eyes of 95 patients with myopia who desired surgical correction of myopia ranging from -2.00 to -7.00 diopters (D) participated.<br />Intervention: Fellow eyes of patients with myopia undergoing bilateral simultaneous LASIK were randomized to single-zone and multizone ablation. Astigmatism was not corrected at the time of LASIK.<br />Main Outcome Measures: Predictability, postoperative videokeratography, and contrast sensitivity were assessed at 3 months after surgery.<br />Results: At 3 months, r2 values relating laser setting to change in spherical equivalent refraction were 0.78 for single-zone and 0.76 for multizone ablation; mean outcome with respect to intended was -0.84 D (0.65 standard deviation [SD]) for single-zone and -0.62 D (0.78 SD) for multizone eyes (P = 0.035). There was no relationship between single-zone and multizone ablation and the likelihood of asymmetric postoperative videokeratography (P = 0.83). The only difference in contrast sensitivity was a significantly greater decrease in log contrast for multizone eyes at 12 cyc/deg under undilated conditions.<br />Conclusions: There is no true difference in predictability between single-zone and multizone LASIK for the correction of low myopia. Separate clinical nomograms for single-zone and multizone LASIK should eliminate the difference in predictability that was observed in this clinical trial.
Details
- Language :
- English
- ISSN :
- 0161-6420
- Volume :
- 105
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Ophthalmology
- Publication Type :
- Academic Journal
- Accession number :
- 9709766
- Full Text :
- https://doi.org/10.1016/S0161-6420(98)98037-X