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Table 2 Comparison of preoperative and postoperative changes in corneal biometric parameters between the two groups

From: Comparison of visual outcomes after femtosecond laser-assisted LASIK versus flap-off epipolis LASIK for myopia

Parameter

Mean ± Standard Deviation

P-value

femto-LASIK

flap-off epi-LASIK

K1 (D)

 Pre-op

42.65 ± 1.25

42.81 ± 2.09

0.828

 Post-op

37.95 ± 2.52

38.04 ± 2.33

0.692

P-value

0.001

< 0.001

 

K2 (D)

 Pre-op

43.79 ± 1.47

43.84 ± 2.11

0.766

 Post-op

38.74 ± 2.73

38.61 ± 2.40

0.942

P-value

0.003

< 0.001

 

CCT (μm)

 Pre-op

597.15 ± 27.69

552.15 ± 28.76

0.597

 Post-op

475.27 ± 28.89

454.89 ± 43.54

0.086

P-value

< 0.001

< 0.001

 

ACD (mm)

 Pre-op

3.06 ± 0.24

3.28 ± 0.30

0.056

 Post-op

2.98 ± 0.22

3.19 ± 0.28

0.066

P-value

0.001

< 0.001

 

Q-value (Ant.)

 Pre-op

−0.41 ± 0.13

−0.39 ± 0.18

0.732

 Post-op

0.88 ± 0.65

0.73 ± 0.33

0.732

P-value

0.001

< 0.001

 

Q-value (Post.)

 Pre-op

−0.30 ± 0.11

−0.30 ± 0.08

0.304

 Post-op

−0.28 ± 0.10

−0.28 ± 0.09

0.231

P-value

0.068

0.337

 
  1. femto-LASIK femtosecond laser-assisted in situ keratomileusis; epi-LASIK epipolis laser-assisted in situ keratomileusis; K1 flattest keratometry reading; D diopters; K2 steepest keratometry reading; CCT central corneal thickness; Pre-op preoperative; Post-op postoperative; ACD anterior chamber depth (between endothelium to anterior lens surface); Ant. anterior corneal surface; Post. posterior corneal surface; Q-value corneal asphericity