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Table 1 Preoperative parameters

From: Comparison of outcomes after topography-modified refraction versus wavefront-optimized versus manifest topography-guided LASIK

Parameter (mean ± SD) WFO Manifest TG TMR P-value
BCVA (logMAR) −0.06 ± 0.07 −0.07 ± 0.07 −0.08 ± 0.06 .122
Sphere (D) −4.01 ± 1.65 −4.31 ± 1.95 −3.52 ± 2.23 .085
Cylinder (RA; D) −0.89 ± 0.55 −0.99 ± 0.70 −1.09 ± 0.69 .172
MRSE (D) −4.45 ± 1.75 −4.81 ± 1.95 −4.06 ± 2.26 .142
Pachymetry (μm) 542.80 ± 27.24 534.95 ± 31.01 537.62 ± 25.49 .300
Flat keratometry (D) 42.66 ± 1.38 42.68 ± 1.29 42.64 ± 1.22 .986
Steep keratometry (D) 43.88 ± 1.41 43.85 ± 1.32 44.01 ± 1.32 .774
CA (D) 1.22 ± 0.63 1.17 ± 0.59 1.37 ± 0.63 .171
Magnitude difference between CA and RA (D) 0.33 ± 0.39 0.18 ± 0.36 0.33 ± 0.39 .146
Axis difference between CA and RA (°) 15.91 ± 20.46 18.60 ± 21.19 12.78 ± 18.52 .288
  1. WFO = wavefront-optimized; TG = topography-guided; TMR = topography-modified refraction; D = diopters; BCVA = best-corrected distance visual acuity; logMAR = logarithm of the minimal angle of resolution; RA = refractive astigmatism; MRSE = manifest refraction spherical equivalent; CA = corneal astigmatism