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Table 1 Preoperative and Intra-Operative Parameters

From: Refractive, visual, and subjective quality of vision outcomes for very high myopia LASIK from − 10.00 to − 13.50 diopters

  Mean ± SD Range
Preoperative variables
 Sphere (D) −10.33 ± 0.82 − 8.75 to − 12.50
 Cylinder (D) −1.20 ± 0.87 0.00 to − 4.25
 Spherical equivalent (D) −11.02 ± 0.81 −10.00 to − 13.50
 Central corneal thickness (μm) 580.3 ± 25.9 519 to 656
 Pupil diameter (mm) 6.9 ± 0.9 4.4 to 8.6
 Minimum keratometry (D) 43.5 ± 1.8 39.6 to 49.0
 Maximum keratometry (D) 44.8 ± 1.7 41.3 to 50.2
Intra-operative variables
 Average flap thickness (μm) 117.2 ± 21.3 90.0 to 141.4
 Average ablation (μm) 137.7 ± 10.8 115.6 to 164.1
 Average % of cornea ablated 42.6 ± 2.4 38.4 to 47.7
 Residual stromal bed (μm) 314.3 ± 62.3 280.0 to 381.5
 Optical zone (mm) 6.5 ± 0.1 6.0 to 6.5