Table 1 Demographic data and preoperative baseline characteristics.

From: Transepithelial photorefractive keratectomy: a prospective randomized comparative study between the two-step and the single-step techniques

Parameter

2 Step PTK-PRK

Single Step TE-PRK

p value

No. of Eyes

50

50

No. of Patients

25

25

Age (years)a

25.1 ± 1.4

25.4 ± 1.9

0.912

Range

20–35

20–37

 

Gender (Female/Male)

(16/9)

(17/8)

UDVA (logMAR)a

1.04 ± 0.19

1.03 ± 0.23

0.948

CDVA (logMAR)a

0.02 ± 0.006

0.02 ± 0.006

0.697

Manifest Sphere (D)a

−2.42 ± 0.18

−2.37 ± 0.25

0.548

Range

From 0 to −5

From 0 to −6

Manifest Cylinder (D)a

−1.50 ± 0.16

−1.26 ± 0.14

0.329

Range

From 0 to −4

From 0 to −4

 

MRSE (D)a

−3.17 ± 1.14

−2.99 ± 1.61

0.269

Range

From −1 to −5.5

From −0.75 to −6

Central Epithelial Thickness (μm)a

52.68 ± 2.21

53.24 ± 1.82

0.096

Range

49–56

50–57

 

Calculated depth of ablation (μm)a

61.76 ± 15.38

61.34 ± 23.37

0.694

Range

31–88

23–108

 

Schirmer I test (mm)a

16.66 ± 0.9

16.42 ± 1.0

0.234

Range

15–18

15–19

 

TBUT (seconds)a

12.04 ± 0.79

11.88 ± 0.79

0.275

Range

10 to 13

10 to 14

 
  1. Independent Sample T-test to compare means between the two groups.
  2. CDVA Corrected distance visual acuity, D Dioptres, logMAR logarithm of the minimum angle resolution, MRSE Manifest refractive spherical equivalent, PTK-PRK Phototherapeutic keratectomy-photorefractive keratectomy, TBUT Tear film break-up time,TE-PRK Transepithelial photorefractive keratectomy, UDVA Uncorrected distance visual acuity.
  3. aData expressed as Mean ± SD/SE, Range.