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PRK (n=100 eyes)
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tPRK (n=100 eyes)
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P value*
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Right eyes
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Left eyes
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All eyes
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Right eyes
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Left eyes
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All eyes
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UCDVA (decimal), mean ± SD
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Day 4
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0.53 ± 0.09
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0.53 ± 0.09
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0.53 ± 0.09
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0.73 ± 0.17
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0.71 ± 0.17
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0.72 ± 0.17
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< 0.001
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Day 7
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0.62 ± 0.09
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0.63 ± 0.08
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0.63 ± 0.08
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0.87 ± 0.19
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0.84 ± 0.17
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0.86 ± 0.18
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< 0.001
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6w
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1.09 ± 0.07
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1.1 ± 0.07
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1.1 ± 0.07
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1.1 ± 0.071
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1.1 ± 0.07
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1.1 ± 0.07
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> 0.05
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BCDVA (decimal), mean ± SD, 6w
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1.21 ± 0.17
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1.21 ± 0.16
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1.21 ± 0.16
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1.18 ± 0.15
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1.18 ± 0.16
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1.18 ± 0.15
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> 0.05
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Refractive error (D), mean ± SD, 6w
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Sphere
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0.34 ± 0.28
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0.30 ± 0.27
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0.32 ± 0.27
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0.22 ± 0.28
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0.23 ± 0.27
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0.21 ± 0.30
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> 0.05
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Cylinder
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- 0.24 ± 0.13
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- 0.25 ± 0.17
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- 0.23 ± 0.14
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-0.25 ± 0.26
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-0.27 ± 0.32
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- 0.21 ± 0.21
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> 0.05
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SE off target
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0.13 ± 0.28
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0.10 ± 0.28
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0.12 ± 0.28
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0.03 ± 0.21
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0.03 ± 0.21
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0.03 ± 0.21
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> 0.05
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Pain Score (0-15), mean ± SD
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10.4 ± 1.37
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11.16 ± 1.42
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10.8 ± 1.44
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5.80 ± 3.00
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5.00 ± 2.70
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5.4 ± 2.84
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< 0.0001
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Epithelial healing (hours), mean ± SD
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60.2 ± 8.02
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58.0 ± 5.15
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59.10 ± 6.79
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47.12 ± 9.22
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44.40 ± 9.58
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45.76 ± 9.46
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< 0.0001
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- BCDVA best corrected distance visual acuity, D diopter, UCDVA uncorrected distance visual acuity, PRK photorefractive keratectomy, tPRK transepithelial photokeratectomy, SE spherical equivalent, SD standard deviation, w weeks
- *p-value refers to comparison of PRK (all eyes) and tPRK (all eyes)
