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Table 4 Comparison of chord u measurements before and after implantable collamer lens (ICL) implantation

From: Measurement of the distance between corneal apex and pupil center in patients following small-incision lenticule extraction or implantable collamer lens implantation and its correlation with the surgical-induced astigmatism

 

Preoperative

Postoperative

P#

OD (n = 110)

   

Magnitude (mm)

0.205 ± 0.106

(0.04, 0.55)

0.208 ± 0.127

(0.02, 0.65)

0.972

Orientation (°)

100.5 ± 84.0

(0, 358)

133.1 ± 107.6

(0, 358)

0.008*

X-intercept (mm)

0.067 ± 0.136

(-0.23, 0.41)

0.052 ± 0.163

(-0.33, 0.54)

0.068

Y-intercept (mm)

0.118 ± 0.129

(-0.20, 0.53)

0.078 ± 0.155

(-0.29, 0.64)

< 0.001

OS (n = 110)

   

Magnitude (mm)

0.208 ± 0.113

(0.01, 0.55)

0.202 ± 0.121

(0.02, 0.59)

0.26

Orientation (°)

129.2 ± 65.2

(0, 333)

144.6 ± 80.5

(0, 351)

0.14

X-intercept (mm)

-0.079 ± 0.138

(-0.44, 0.27)

-0.076 ± 0.153

(-0.42, 0.23)

0.333

Y-intercept (mm)

0.118 ± 0.131

(-0.26, 0.47)

0.081 ± 0.143

(-0.25, 0.52)

< 0.001

  1. # Wilcoxon signed-rank test