Visual Performance after Bilateral Implantation of a Four-Haptic Diffractive Toric Multifocal Intraocular Lens in High Myopes

Table 4

Vectorial analysis at the last visit (28 eyes).

Parameter	Arithmetic mean ± SD	Range	Vector mean	Geometric mean
Target induced astigmatism (D)	2.19 ± 0.85	0.92, 4.27	0.89 × 0.58	—
Surgically induced astigmatism (D)	2.64 ± 0.98	1.11, 4.80	1.06 × 0.80	—
Difference vector (D)	0.67 ± 0.54	0.02, 2.21	0.54 × 0.55	—
Magnitude of error (D)	0.45 ± 0.50	−0.21, 2.15	—	—
Angle of error (degrees)	−2.15 ± 8.25	−36.69, 6.79	—	—
Absolute angle of error (degrees)	4.78 ± 7.02	0.00, 36.69	—	—
Correction index	1.23 ± 0.23	0.92, 1.81	—	1.22
Index of success	0.34 ± 0.29	0.01, 1.29	—	0.28

D, dioptre.