Accuracy of Corneal Astigmatism in Different Region Modes

Accuracy of Corneal Astigmatism in Different Region Modes

To analyze the difference between measured total corneal astigmatism and actual corneal astigmatism under different region modes and optimize the region setting.

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;