Accuracy of Corneal Astigmatism in Different Region Modes

Inclusion Criteria: * Age ≥ 18 years * Patients who had received phacoemulsification surgery with or without implantation of toric IOL are with a certain amount of corneal astigmatism. * Best corrected visual acuity ≥ 0.66 (20/30 Snellen) Exclusion Criteria: * Corneal diseases or severe irregular astigmatism (e.g., pterygium, keratoconus), existence of corneal opacification; * Ocular disease which may affect visual acuity (e.g., glaucoma, uveitis, retinal disease, pathologic myopia); * History of ocular surgery or ocular trauma before this cataract surgery; * Decentration of IOL \> 0.3mm or tilt \> 5° * Implantation of multifocal IOL * history of wearing of rigid contact lens within the past 4 weeks or soft contact lens within 1 week;