Table 2 Comparison of the efficacy and predictability indices between the two groups 6 months after surgery.

From: Refraction and topographic risk factors for early myopic regression after small-incision lenticule extraction surgery

Index

Nonregression group, (N = 406)

Regression group, (N = 14)

P value

UCVA

0.99 ± 0.02

0.80 ± 0.16

 < 0.001*

BCVA

1.00 ± 0.07

0.96 ± 0.09

0.053

Manifest refraction

 SE

0.01 ± 0.12

 − 1.07 ± 0.75

 < 0.001*

 Sphere

0.02 ± 0.15

 − 0.81 ± 0.85

 < 0.001*

 Cylinder

 − 0.01 ± 0.10

 − 0.48 ± 0.45

 < 0.001*

AXL

25.84 ± 1.04

26.47 ± 1.60

0.029*

CCT

 Apex

449.64 ± 30.29

446.93 ± 28.88

0.741

 Thinnest

447.08 ± 30.34

444.43 ± 28.72

0.748

 Difference

2.57 ± 1.67

2.50 ± 1.16

0.958

Steep corneal curvature

38.94 ± 1.86

39.39 ± 2.32

0.084

Flat corneal curvature

38.05 ± 1.86

38.43 ± 2.01

0.071

Corneal cylinder

 − 0.89 ± 0.43

 − 0.97 ± 0.71

0.536

TCRP

35.42 ± 2.15

35.01 ± 1.18

0.276

  1. Mann–Whitney U test was used for comparisons of postoperative visual acuity, refraction and topographic parameters between groups.
  2. AXL axial length, BCVA best-corrected visual acuity, CCT central corneal thickness, N number, SE spherical equivalent, TCRP total corneal refractive power, UCVA uncorrected visual acuity.
  3. *Denotes a significant difference between groups.
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