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. 2016 Dec 19;11(12):e0165474. doi: 10.1371/journal.pone.0165474

Table 5. The results of the spherical equivalent and the error between postoperative spherical equivalent and the calculated target refraction by the SRK-T formula and HOFFER-Q modified formula.

SRK-T formula HOFFER-Q modified formula
The spherical equivalent (mean±SD) -0.53±1.05 D -0.48±1.65 D
The proportion of post operative spherical equivalent within 0±0.5D 45% 41%
The proportion of post operative spherical equivalent within 0±1D 78% 82%
The error between postoperative spherical equivalent and the calculated target refraction (mean±SD) 0.35±0.72 D -0.31±0.86 D
The proportion of postoperative spherical equivalent within calculated target refraction±0.5D 55% 58%
The proportion of postoperative spherical equivalent within calculated target refraction±1D 84% 88%