Comparison of refractive and visual outcomes with centration points 80% and 100% from pupil center toward the coaxially sighted corneal light reflex

LASIK centration best between pupil centre and light reflex

This retrospective study carried out in China suggest that using 80 per centration away from the pupil centre toward the coaxially sighted corneal light reflex when performing LASIK ablations results in less overcorrection and residual astigmatism than performing ablations centred directly on the coaxially sighted corneal light reflex. The study involved 228 eyes of 114 patients all of whom underwent LASIK. There were no differences in the preoperative variables between groups. Three months postoperatively, the sphere was significantly more hyperopic in the 80% group than in the 100% group (0.19 diopter [D] versus 0.09 D) (P = .009) and the cylinder was significantly lower in the 80% group (0.25 D versus 0.33 D) (P = .011). More eyes achieved zero astigmatism in the 80% group than in the 100% group (43.9 per cent versus 34.2 per cent), and fewer eyes had astigmatism greater than 0.75 D in the 80% group (0.9 per cent versus 6.1 per cent (P = .039). The error from the target refraction indicated that the 80% group tended to have significantly less undercorrection (P = .045). There were no significant differences in the other outcomes. Subgroup analysis did not show significant differences for eyes with a large-angle κ.