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Table 1 Demographics and Preoperative Parameters

From: Comparison of refractive outcomes after photorefractive keratectomy with different optical zones using Mel 90 excimer laser

Parameters

Demographics

p value

Group 1 (Mean ± SD)

Group 2 (Mean ± SD)

Age (years)

29.92 ± 3.92

28.41 ± 6.09

0.165

Sex (M:F)

9:11

12:16

Follow up period (months)

20.71 ± 10.52

17.47 ± 6.57

0.07

SE of MR (D)

−6.31 ± 2.43

−5.47 ± 2.15

0.078

Sim K (D)a

43.53 ± 1.40

43.09 ± 0.92

0.072

TCT (μm)a

545.71 ± 27.30

555.67 ± 33.25

0.131

Q valuea

0.14 ± 0.12

0.16 ± 0.13

0.368

RMS of HOAs (μm)b

0.38 ± 0.11

0.36 ± 0.10

0.293

SA (μm)b

0.22 ± 0.08

0.21 ± 0.07

0.300

Number of eyes

40

55

  1. SD Standard deviation, SE of MR Spherical equivalent of manifest refraction, Sim K Simulated keratometry, TCT Thinnest corneal thickness, RMS of HOAs Route mean square of higher order abberations, SA Spherical aberration
  2. aAll topographic parameters were measured by Galilei G4 (Sim K was measured in the 4.0 mm zone, TCT was measured on the thinnest pachy map, Q value was measured in the 8.0 mm zone)
  3. bAll aberration parameters were measured by KR-1 W (RMS of HOAs and SA)