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Table 2 Comparison of chord u measurements before and after small-incision lenticule extraction (SMILE) surgery

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 = 112)

   

Magnitude (mm)

0.153 ± 0.086

(0.01, 0.43)

0.188 ± 0.097

(0.01, 0.60)

< 0.001

Orientation (°)

152.9 ± 101.2

(13, 357)

141.0 ± 92.7

(0, 354)

0.111

X-intercept (mm)

-0.003 ± 0.114

(-0.27, 0.27)

-0.009 ± 0.135

(-0.31, 0.31)

0.502

Y-intercept (mm)

0.06 ± 0.12

(-0.24, 0.41)

0.08 ± 0.14

(-0.22, 0.59)

0.006

OS (n = 112)

   

Magnitude (mm)

0.161 ± 0.103

(0.01, 0.74)

0.186 ± 0.107

(0.02, 0.62)

0.007

Orientation (°)

152.9 ± 101.7

(0, 357)

137.0 ± 98.3

(0, 342)

0.558

X-intercept (mm)

0.008 ± 0.129

(-0.60, 0.36)

0.005 ± 0.145

(-0.50, 0.40)

0.757

Y-intercept (mm)

0.055 ± 0.13

(-0.44, 0.44)

0.069 ± 0.143

(-0.36, 0.40)

0.092

  1. # Wilcoxon signed-rank test
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BMC Ophthalmology

ISSN: 1471-2415

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