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Can light therapy soothe the brain? a pupil test holds clues

NCT ID NCT03811964

Knowledge-focused Sponsor: University Hospital, Strasbourg, France 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 20, 2026 · Last updated Aug 21, 2026 · Updated 1 time

Summary

This study explores how light influences the body beyond vision—affecting sleep, mood, and thinking—in people with sleep disorders, neurological conditions, psychiatric conditions, or eye diseases. Researchers will measure the pupil's response to specific light exposures to understand how the brain's non-visual light pathways work. The goal is to better understand these effects and potentially pave the way for new light-based therapies.

What this could mean

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

Active substance
Specific light exposures using a wide range of intensities or different light/dark regimens
What this could lead to
If successful, this could lead to new light-based therapies for sleep and mood disorders in people with neurological, psychiatric, or eye conditions.
What could go wrong
This is an observational study, so it won't directly test treatments. The results may not apply to everyone, and the exact role of light in these conditions remains uncertain.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 726 people

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

Started

Jan 2020

Expected to finish

Feb 2028

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.

Ages

18 years and older

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: * Man or woman * Aged 18 years or older * Subject having signed a free and informed consent * Subject affiliated to a social protection scheme Arm 1 :Subjects with primary sleep-wake disorder Arm 2 : subjects presenting a neurological pathology with disorder of the controls of the wake and the sleep Arm 3 : subject presenting a psychiatric pathology pathology with disorder of the controls of the wake and the sleep Arm 4 : subject presenting an ophthalmological pathology with possible alteration of the photoreception and / or phototransduction Arm 5 : subjects with photosensitivity with regulation disorder of sleep and wake Arm 6 : healthy subject Exclusion Criteria: Age-Related Macular Degeneration (AMD) and all maculopathies (retinopathies pigmentosa, macular involvement of diabetes) * Cataract with significant vision loss \<5/10 * Chorioretinal neovascularization * Subject in exclusion period determined by previous or current study * Impossibility to give the subject information enlightened (subject in emergency situation, difficulties of understanding the subject, ...) * Subject under the protection of justice * Subject under guardianship or curatorship * Pregnancy / Breastfeeding

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Conditions

The condition(s) this trial relates to.

psychiatric disorder sleep-wake disorder

As listed by the trial registrant

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

Neurological pathologies Ophthalmological pathologies Psychiatric pathologies Sleep disorders

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

  • University Hospital, Strasbourg, France

    RECRUITING

    Strasbourg, 67000, France

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