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Table 1 Comparison between the subgroups of ANN group (ICRS and ICRS+CXL), in preoperative and postoperative period

From: Artificial neural network to guide intracorneal ring segments implantation for keratoconus treatment: a pilot study

 VariablesGroupp value
ICRSICRS + CXL
Pre-opGrade of keratoconus2.13 ± 1.132.67 ± 0.89p > 0.05
UDVA [Decimal value (LogMAR)]0.22 ± 0.14
(0.66)
0.14 ± 0.14
(0.85)
p > 0.05
CDVA [Decimal value (LogMAR)]0.68 ± 0.24
(0.17)
0.53 ± 0.20
(0.28)
p > 0.05
SE (D)−2.27 ± 2.92−4.97 ± 3.82p > 0.05
Sim-K Avg (D)46.33 ± 2.7948.38 ± 4.32p > 0.05
CCT (μm)475.63 ± 41.66473.25 ± 42.28p > 0.05
ThkMin (μm)459.63 ± 45.63456.83 ± 44.48p > 0.05
Corneal volume (mm3)54.53 ± 3.1254.14 ± 2.90p > 0.05
Total aberrations (μm)4.44 ± 2.035.98 ± 2.79p > 0.05
High Order aberrations (μm)3.26 ± 1.763.98 ± 2.31p > 0.05
Astigmatism aberrations (μm)3.38 ± 1.283.78 ± 2.93p > 0.05
Coma-like aberrations (μm)3.16 ± 1.773.84 ± 2.30p > 0.05
Spherical-like aberrations (μm)0.81 ± 0.271.01 ± 0.38p > 0.05
Post-opUDVA [Decimal value (LogMAR)]0.37 ± 0.21
(0.43)
0.36 ± 0.22
(0.44)
p > 0.05
CDVA [Decimal value (LogMAR)]0.78 ± 0.18
(0.11)
0.70 ± 0.24
(0.15)
p > 0.05
SE (D)−2.39 ± 2.22−2.71 ± 2.61p > 0.05
Sim-K Avg (D)45.07 ± 2.2845.50 ± 5.37p > 0.05
CCT (μm)478.38 ± 37.54469.25 ± 55.85p > 0.05
ThkMin (μm)454.50 ± 47.66433.75 ± 50.22p > 0.05
Corneal volume (mm3)55.24 ± 3.7255.13 ± 3.07p > 0.05
Total aberrations (μm)3.91 ± 2.665.58 ± 2.72p > 0.05
High Order aberrations (μm)2.46 ± 0.733.93 ± 2.27p > 0.05
Astigmatism aberrations (μm)2.94 ± 2.863.81 ± 1.92p > 0.05
Coma-like aberrations (μm)2.09 ± 0.513.13 ± 1.78p > 0.05
Spherical-like aberrations (μm)1.20 ± 0.462.22 ± 1.65p > 0.05
  1. In the ANN group, considering the two subgroups ICRS group and ICRS+CXL group, there is no statistically significant difference in terms of grade of keratoconus, UDVA (uncorrected distance visual acuity), CDVA (corrected distance visual acuity), SE (spherical equivalent), Sim-K Avg (simulated mean keratometry), CCT (central corneal thickness), ThkMin (minimal thickness), corneal volume and corneal aberrations, neither in the preoperative nor in the postoperative period (p > 0.05). Visual acuity is expressed in decimal value and the corresponding LogMAR value is reported in brackets