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Table 1 Baseline characteristics of the study population

From: SmartSurfACE transepithelial photorefractive keratectomy with mitomycin C enhancement after small incision lenticule extraction

Parameter SMILE group TPRK group
Eyes   
 Number 1920 68
 Patients 960 40
Laterality (n, %)   
 Right 960 (50%) 36 (53%)
 Left 960 (50%) 32 (47%)
Age (years)   
 Mean ± SD 25.0 ± 2.8 26.0 ± 4.2
 Range (21 to 37) (21 to 35)
Sex (n, %)   
 Male 326 (34%) 16 (40%)
 Female 634 (66%) 24 (60%)
Refraction SE (D)   
 Mean ± SD  − 5.50 ± 1.20  − 1.42 ± 0.52
 Range (− 2.50 to − 8.50) (− 0.75 to − 2.50)
Sphere (D)   
 Mean ± SD  − 4.30 ± 1.32  − 1.21 ± 1.10
 Range  − 2.25 to − 7.75  − 0.50 to − 2.10
Cylinder (D)   
 Mean ± SD  − 1.63 ± 0.82  − 0.57 ± 0.50
 Range  − 0.75 to − 2.75 0.00 to − 1.50
CCT (μm)   
 Mean ± SD 530.0 ± 10.2 491.0 ± 13.2
 Range (508 to 560) (470 to 511)
K readings (D)   
 Mean ± SD 43.0 ± 1.6 40.0 ± 1.3
 Range (42 to 46) (38 to 41)
CDVA (logMAR)   
 Mean ± SD 0.26 ± 0.08 0.14 ± 0.06
 Range (0.00 to 0.6) (− 0.1 to 0.2)
CH   
 Mean ± SD 10.40 ± 0.92 8.60 ± 1.56
 Range (9.7 to 13.1) (7.8 to 11.2)
CRF   
 Mean ± SD 10.20 ± 1.24 9.20 ± 1.66
 Range (9.6 to 13.3) (8.3 to 11.5)
  1. SMILE small incision lenticule extraction; TPRK transepithelial photorefractive keratectomy; SD standard deviation; SE spherical equivalent; CCT central corneal thickness; K keratometry; CDVA corrected distance visual acuity; CH corneal hysteresis; CRF corneal resistant factor; D diopter