Table 2: Results of the Cartesian coordinates based analysis.

Type of astigmatism Mean ± SDCentroid
(mean ± SD)
Coherence (%)
value value

Preoperative astigmatism1.42 × 179
(1.49 ± 1.34)
95
12-week postoperative astigmatism2.48 × 0
(2.80 ± 1.40)
89
SIA at 12 weeks1.07 × 1
(1.62 ± 0.90)
66

SIA: surgically induced astigmatism; SD: standard deviation. Centroid values are presented as plus cylinders in diopters.