Accuracy of Corneal Astigmatism in Different Region Modes

Launched by WENZHOU MEDICAL UNIVERSITY · Sep 27, 2017

Keywords

ClinConnect Summary

This clinical trial is looking at how accurately we can measure astigmatism in the cornea, which is the clear front part of the eye. Astigmatism is a common vision problem caused by an irregular shape of the cornea, which can make vision blurry. The study aims to understand the differences between what we measure and the actual condition of the cornea in different areas, in order to improve how we set up our measuring tools.

To participate in this trial, you need to be at least 18 years old and have undergone a specific eye surgery called phacoemulsification, which is often done to treat cataracts. You should also have a certain level of astigmatism and be able to see well with the best correction (like glasses or contact lenses). However, people with certain eye diseases or previous eye surgeries may not be eligible. If you join, you can expect to undergo some tests related to your eyesight and the shape of your cornea, all while helping researchers find better ways to manage astigmatism.

Gender

ALL

Eligibility criteria

• 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;