Table 1 Preoperative patient characteristics in KLEx and WG-LASIK.

From: Correlation between effective optical zone and higher-order aberrations in keratorefractive lenticule extraction and wavefront-guided laser in situ keratomileusis

 

KLEx (n = 141)

WG-LASIK(n = 130)

P

Sex (male, %)

20 (28.2)

24 (36.9)

0.276

Age (years)

31.13 ± 6.20

29.11 ± 4.83

0.16

Sphere (D)

−5.55 ± 2.14

−5.29 ± 2.00

0.428

Cylinder (D)

−1.02 ± 0.67

−1.07 ± 0.84

0.942

Spherical Equivalent (D)

−6.06 ± 2.16

−5.83 ± 2.01

0.555

Scotopic pupil size (mm)

6.63 ± 0.65

6.71 ± 0.83

0.289

POZ (mm)

6.61 ± 0.23

6.92 ± 0.25*

< 0.001

Tomographic parameters

CCT (µm)

561.29 ± 26.12

555.73 ± 30.14

0.112

TCT (µm)

556.33 ± 27.04

549.94 ± 30.12

0.053

KM (D)

43.50 ± 1.55

43.50 ± 1.57

0.837

Anterior corneal Q value

−0.34 ± 0.11

−0.31 ± 0.11

0.121

µ (mm)

0.20 ± 0.12

0.18 ± 0.09

0.161

µ(x) (mm)

0.11 ± 0.09

0.11 ± 0.08

0.632

µ(y) (mm)

0.15 ± 0.11

0.12 ± 0.08

0.221

Higher order aberrations (RMS)

HOA (µm)

0.14 ± 0.06

0.13 ± 0.04

0.879

Coma (µm)

0.07 ± 0.04

0.07 ± 0.04

0.543

Vertical coma (µm)

0.06 ± 0.04

0.06 ± 0.04

0.354

Horizontal coma (µm)

0.06 ± 0.04

0.06 ± 0.04

0.354

SA (µm)

0.06 ± 0.03

0.07 ± 0.03

0.208

Trefoil (µm)

0.06 ± 0.05

0.05 ± 0.03

0.501

Oblique trefoil (µm)

0.05 ± 0.05

0.04 ± 0.03

0.256

Horizontal trefoil (µm)

0.03 ± 0.02

0.03 ± 0.03

0.751

  1. Continuous and categorical variables are expressed as mean ± standard deviation and number (percentage), respectively.
  2. *The POZ diameter of WG-LASIK was determined as the mean of the long and short axis of the optical zone.
  3. KLEx, keratorefractive lenticule extraction; WG-LASIK, wavefront-guided laser in situ keratomileusis; POZ, planned optical zone; CCT, central corneal thickness; TCT, thinnest corneal thickness; KM, mean keratometry; µ, chord distance (mm); µ(x) & µ(y), x & y deviation of CV from PC (mm); RMS, root mean square; HOA, higher order aberration; SA, spherical aberration.
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