The art of nomograms

Table 3 Comparison of the virtual refractive outcomes for all nomograms

	Post-op SEq (D) (Mean ± SD) (Range)	Post-op Cyl (D) (Mean ± SD) (Range)	p value compared to actual outcomes
Actual outcomes	−0.08 ± 0.36 − 1.12 to + 0.75	0.16 ± 0.21 0.00 to 0.75	–
Nomogram 1: Sph + negCyl	0.00 ± 0.35 − 1.20 to + 0.91	0.12 ± 0.17 0.00 to 0.75	< 0.0001
Nomogram 2: Sph + posCyl	0.00 ± 0.35 − 1.19 to + 0.95	0.12 ± 0.17 0.00 to 0.75	< 0.0001
Nomogram 3: SEq + Ast	0.00 ± 0.35 − 1.19 to + 0.93	0.12 ± 0.17 0.00 to 0.75	< 0.0001
Nomogram 4: Cyl₁ + Cyl₂	0.00 ± 0.35 − 1.20 to + 0.93	0.13 ± 0.17 0.00 to 0.78	< 0.0001
Nomogram 5: SEq + (C₊,C_x)	0.00 ± 0.35 − 1.19 to + 0.93	0.14 ± 0.16 0.02 to 0.79	< 0.0001
Nomogram 6: Cyclotorsion	0.00 ± 0.35 − 1.19 to + 0.93	0.14 ± 0.16 0.00 to 0.74	< 0.0001
Nomogram 7: SEq + C₊ + C_x	0.00 ± 0.35 − 1.20 to + 0.91	0.19 ± 0.17 0.05 to 0.80	< 0.0005

Ast = astigmatism; C₊ = cardinal astigmatism; C_x = oblique astigmatism; negCyl = negative cylinder; posCyl = positive cylinder; SEq = spherical equivalent; Sph = sphere

ISSN: 2326-0254