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J.I. Ou, E.E. Manche; Ablation Centration and Visual Outcome Measurements in Myopic Eyes Treated with Laser in Situ Keratomileusis (LASIK) using the CustomVue Visx S4 Excimer Laser . Invest. Ophthalmol. Vis. Sci. 2004;45(13):203.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To determine the ablation centration and visual outcome measurements in myopic eyes treated with Laser in Situ Keratomileusis (LASIK) using the CustomVue Visx S4 excimer laser. Methods:Retrospective review of 44 myopic eyes of 25 patients treated with LASIK CustomVue Visx S4 was conducted. Corneal topography was used to determine ablation centration. Manifest refraction, best spectacle corrected visual acuity (BSCVA), and uncorrected visual acuity (UCVA) preoperatively and at 3 months postoperatively were also evaluated. Results: Twenty out of 44 eyes were available for ablation centration analysis at 3 months. Mean decentration (from ablation zone to entrance pupil) was 0.23 mm +/– 0.08 (SD) at 3 months postoperatively. No eyes were decentered more than 0.5 mm. All eyes in the study were available for evaluation of visual outcomes. Preoperatively, the mean spherical equivalent was – 4.11 +/– 1.29 diopters (D) (range, –6.88 to –1.75 D). At 3 months, mean spherical equivalent was – 0.41 +/– 0.38 D (range, –1.75 to 0.25 D). Forty–four out of 44 eyes (100%) had BSCVA preoperatively of 20/20. Forty–two out of 43 eyes (98%) had UCVA of 20/40 and 39 out of 42 eyes had UCVA of 20/20 (91%) at 3 months postoperatively. Conclusions: Determining ablation centration and visual outcome measures using Customvue Visx S4 excimer laser is important in refractive surgery, especially when correcting higher order aberrations. No evidence of moderate decentration (0.5 mm or greater) was found in this study. Visual outcome measurements are comparable to data from studies of Visx S3 ActiveTrak
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