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Table 1 Refractive outcomes during the follow-up period

From: Four-year observation of predictability and stability of small incision lenticule extraction

Variables Preoperative 6 Months postoperative 4 Years postoperative P (Preop to 4 years postop) P (6 Months to 4 years postop)
LogMAR UDVA
 Mean ± SD   -0.05 ± 0.06 -0.04 ± 0.06 - 0.094
 Medium(IQR) - -0.08(-0.08 to 0) -0.08(-0.08 to 0)   
LogMAR CDVA
 Mean -0.01 ± 0.03 -0.08 ± 0.06 -0.08 ± 0.06 <0.001 0.570
 Medium(IQR) 0(0 to 0) -0.08(-0.08 to -0.08) -0.08(-0.08 to -0.08)   
Sphere (D)
 Mean ± SD -5.94 ± 1.45 0.14 ± 0.35 0.05 ± 0.41 <0.001 0.278
 Range -8.50 to -3.25 -0.50 to 1.25 -1.00 to 1.25   
Cylinder (D)
 Mean ± SD -0.73 ± 0.49 -0.29 ± 0.27 -0.28 ± 0.29 <0.001 0.747
 Medium(IQR) -0.50(-1.00 to 0) -0.25(-0.50 to 0) -0.25(-0.50 to 0)   
SE
 Mean ± SD -6.30 ± 1.47 -0.01 ± 0.33 -0.09 ± 0.39 <0.001 0.929
 Range -8.75 to -3.50 -0.75 to 0.88 -1.00 to 0.88   
The efficacy index
 Mean ± SD - 1.11 ± 0.17 1.07 ± 0.16 - 0.275
 Medium(IQR)   1.0(1.0 to 1.2) 1.0(1.0 to 1.2)   
The safety index
 Mean ± SD - 1.17 ± 0.15 1.16 ± 0.14 - 0.622
 Medium(IQR) - 1.2(1.0 to 1.2) 1.2(1.0 to 1.2)   
  1. Preop preoperative, Postop postoperative, UDVA uncorrected distance visual acuity, IQR interquartile range, CDVA corrected distance visual acuity, D diopters, SE spherical equivalent