Eye test may predict who benefits from depression therapy
NCT ID NCT07474974
First seen Jun 27, 2026 · Last updated Sep 18, 2026 · Updated 3 times
Summary
This study looks at whether a simple eye test can predict how well people with treatment-resistant depression will respond to a brain stimulation therapy called TMS. Researchers will measure how the pupils react to light before and after TMS treatment in 44 adults. The goal is to find a way to personalize depression care and avoid ineffective treatments.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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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
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About 44 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Mar 2026
- Expected to finish
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Jul 2027
An estimate. End dates often move.
- Lead sponsor
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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
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18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Diagnosis of MDD, confirmed via the structured clinical interview; * TRD type; * Age between 18-65 years; * Visual acuity of 20/32 or better. Exclusion Criteria: * Prior rTMS treatment; * Contraindications for TMS; * Psychiatric disorders other than MDD; * Systemic diseases affecting the eyes (e.g., diabetes mellitus); * Ocular conditions; * Head injuries causing loss of consciousness; * Current or past alcohol/substance dependence within 6 months; * Neurodegenerative diseases; * Major neurological illnesses; * Use of medications affecting iris mechanics or the autonomic nervous system.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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
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RISE-Health, Center for Translational Health and Medical Biotechnology Research (TBIO), School of Health, Polytechnic of Porto
RECRUITINGPorto, Porto District, 4200-072, Portugal
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