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Clinical trial Recruiting at 1 site Observational Ages 18 and up

Analyzing corneal astigmatism measurements in different regions

Official title: Accuracy of Corneal Astigmatism in Different Region Modes

Run by Wenzhou Medical University · NCT03299530 · Data updated 2026-11-12

This study is testing how different ways of measuring corneal astigmatism can help improve accuracy for patients who have had cataract surgery.

Quick facts

Study typeObservational
Ages18 Years and up
SexAll
Enrollment70 (estimated)
SponsorWenzhou Medical University
Academic / other
Locations1 site (Wenzhou, Zhejiang)
StatusRecruiting
StartedOctober 10, 2017
Main results expectedJune 10, 2027
Study endsOctober 28, 2027
Registry record updatedAugust 19, 2026
Trial IDNCT03299530 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18 and older who have undergone cataract surgery and have a certain level of corneal astigmatism.

Probably not a fit

Patients with severe irregular astigmatism, corneal diseases, or other ocular conditions that may affect visual acuity are unlikely to benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study aims to evaluate the differences between measured total corneal astigmatism and actual corneal astigmatism using various regional modes. The goal is to optimize the region settings for more accurate assessments. Patients with corneal astigmatism who have undergone phacoemulsification surgery will be included in the analysis. The study will focus on understanding how pupil size and other factors influence astigmatism measurements.

Why it matters

Potential benefit: If successful, this study could lead to improved accuracy in diagnosing and treating corneal astigmatism, enhancing visual outcomes for patients.

How similar studies have gone: While there may be studies on corneal astigmatism, this specific approach to analyzing measurements under different regional modes is relatively novel.

Who can join: the full rules

Show full inclusion / exclusion 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;

Where it's running

  • Eye Hispital of Wenzhou Medical University
    Wenzhou, Zhejiang, China     Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
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Astigmatism 22Cornea 6Wenzhou Medical University 3
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.