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Table 2 Clinical results of the implantation of ICRS using the ANN and the manufacturer’s nomogram

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

 

Variables

Pre-op

Post-op

P value

ANN group

UDVA [Decimal value (LogMAR)]

0.17 ± 0.14

(0.77)

0.37 ± 0.21

(0.43)

p = 0.001

CDVA [Decimal value (LogMAR)]

0.60 ± 0.23

(0.22)

0.73 ± 0.21

(0.14)

p < 0.005

SE (D)

−3.89 ± 3.66

−2.58 ± 2.40

p < 0.05

Sim-K1 (D)

45.58 ± 4.05

43.71 ± 4.27

p < 0.001

Sim-K2 (D)

49.80 ± 3.96

47.13 ± 4.56

p = 0.001

Sim-K Avg (D)

47.56 ± 3.84

45.33 ± 4.32

p < 0.001

CCT (μm)

474.20 ± 40.93

472.90 ± 48.44

p > 0.05

ThkMin (μm)

457.95 ± 43.75

442.05 ± 49.05

p < 0.01

Corneal volume (mm3)

54.30 ± 2.92

55.17 ± 3.25

p < 0.05

Total aberrations (μm)

5.36 ± 2.57

4.91 ± 2.76

p > 0.05

High Order aberrations (μm)

3.69 ± 2.09

3.34 ± 1.93

p > 0.05

Astigmatism aberrations (μm)

3.62 ± 2.37

3.47 ± 2.31

p > 0.05

Coma-like aberrations (μm)

3.56 ± 2.08

2.71 ± 1.48

p < 0.05

Spherical-like aberrations (μm)

0.93 ± 0.35

1.84 ± 1.41

p < 0.005

Nomogram group

UDVA [Decimal value (LogMAR)]

0.12 ± 0.11

(0.92)

0.36 ± 0.23

(0.44)

p < 0.001

CDVA [Decimal value (LogMAR)]

0.54 ± 0.19

(0.27)

0.62 ± 0.19

(0.21)

p < 0.01

SE (D)

−4.96 ± 4.16

−1.80 ± 2.48

p = 0.001

Sim-K1 (D)

44.37 ± 4.79

43.15 ± 4.29

p > 0.05

Sim-K2 (D)

48.95 ± 5.48

45.98 ± 4.44

p < 0.001

Sim-K Avg (D)

46.50 ± 4.84

44.98 ± 5.32

p < 0.005

CCT (μm)

457 ± 55.50

453.45 ± 57.25

p > 0.05

ThkMin (μm)

443.55 ± 54.72

431.95 ± 56.43

p < 0.05

Corneal volume (mm3)

53.40 ± 3.47

53.46 ± 4.43

p > 0.05

Total aberrations (μm)

5.66 ± 3.54

4.39 ± 2.76

p < 0.05

High Order aberrations (μm)

3.30 ± 2.18

3.42 ± 2.23

p > 0.05

Astigmatism aberrations (μm)

4.16 ± 3.43

2.36 ± 2.18

p < 0.005

Coma-like aberrations (μm)

3.10 ± 2.13

2.93 ± 2.20

p > 0.05

Spherical-like aberrations (μm)

1.05 ± 0.67

1.58 ± 0.89

p < 0.005

  1. Preoperatively, the ANN group and the nomogram group do not differ significantly in any of the parameters evaluated (p > 0.05). Postoperatively, the ANN group and the nomogram group differed significantly in CDVA (p < 0.05). Visual acuity is expressed in decimal value and the corresponding LogMAR value is reported in brackets