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Can better measurements sharpen vision correction?

NCT ID NCT03299530

Knowledge-focused Sponsor: Wenzhou Medical University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Aug 19, 2026 · Last updated Aug 20, 2026 · Updated 1 time

Summary

This study looks at how accurately different measurement modes capture corneal astigmatism in people who have had cataract surgery. Researchers will compare various device settings to find the most precise way to measure the eye's curvature. The goal is to optimize measurement techniques for better vision correction outcomes.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Measurement of corneal astigmatism using Scheimpflug tomography and other devices
What this could lead to
If successful, this could lead to more precise measurements of corneal astigmatism, potentially improving outcomes for cataract surgery patients with astigmatism.
What could go wrong
The trial is small and observational, so results may not apply broadly. Measurement accuracy may vary with individual eye characteristics.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 70 people

The number the study aims to enrol. It can still change while the study runs.

Started

Oct 2017

Expected to finish

Oct 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Patients who received cataract surgery in The Eye Hospital of Wenzhou Medical University

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

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;

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Conditions

The condition(s) this trial relates to.

astigmatism corneal disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Astigmatism CORNEA

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Eye Hispital of Wenzhou Medical University

    RECRUITING

    Wenzhou, Zhejiang, 325000, China

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