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Eye dominance may influence how well eyes fuse images, study suggests

NCT ID NCT07697131

Knowledge-focused Sponsor: Assistance Publique - Hôpitaux de Paris Source: ClinicalTrials.gov ↗

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 13, 2026 · Last updated Aug 27, 2026 · Updated 3 times

Summary

This study looks at whether a person's dominant eye influences how well their eyes can work together to see a single image, a skill called fusional vergence. Researchers will measure eye fusion in 60 healthy adults aged 18 to 35, comparing results when testing the dominant versus non-dominant eye. The goal is to understand if eye dominance explains differences in fusion measurements, which could eventually help improve vision therapy for people with convergence insufficiency.

What this could mean

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

What this could lead to
If confirmed, this could help orthoptists tailor vision exercises to a person's dominant eye, making therapy more effective for conditions like convergence insufficiency.
What could go wrong
This is a small, early-stage observational study in healthy adults, so findings may not apply to people with vision disorders or to real-world therapy outcomes.

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 60 people

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

Started

Aug 2026

Expected to finish

Jun 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

Any individual between the ages of 18 and 35, inclusive, with no organic ophthalmological disorders or oculomotor disorders.

Ages

18 to 35 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Adults between the ages of 18 and 35 with no known eye conditions, with or without ametropia. If ametropia is present: it must be corrected * Subjects with no history of eye surgery, including refractive surgery * Subjects who have been informed about the study and have freely and knowingly consented to participate in the study and to the collection of data Exclusion Criteria: * Subjects with strabismus * Subjects with visual acuity of less than 20/20; or anisometropia

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Conditions

The condition(s) this trial relates to.

eye disorder

As listed by the trial registrant

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

No eye disorder

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

  • Hôpital Necker-Enfants Malades

    RECRUITING

    Paris, 75015, France

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