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Cannabis and driving: study probes how chronic use blurs vision of moving objects

NCT ID NCT01793961

Knowledge-focused Sponsor: University Hospital, Strasbourg, France Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study investigates whether chronic cannabis use impairs contrast sensitivity — the ability to see objects clearly against their background, especially when they are moving. Researchers will compare three groups: cannabis addicts, tobacco-only smokers, and non-smokers. Participants will take vision tests with static and moving patterns to see if cannabis users have worse contrast detection, which could affect driving safety.

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 cannabis impairs contrast sensitivity, this could help explain why users are at higher risk for car crashes and inform driving safety guidelines.
What could go wrong
This is a small observational study comparing groups, not a treatment trial. It cannot prove cause and effect, and results may not apply to all cannabis users.

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

95 people

The number who actually took part.

Started

Mar 2013

Finished

Sep 2018

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 to 50 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: "Cannabis" Arm * patient addicted to cannabis * Positive CAST test result * Urine tested positive for cannabis metabolites "Tobacco" Arm * positive Fagerström test result * No cannabis intake in the last year before inclusion * No previous history of cannabis use "Healthy Volunteers" * No tobacco or cannabis intake in the last year before inclusion * No history of addictive disorders Exclusion Criteria: * addiction to other substances than cannabis or tobacco * benzodiazepine treatment * patient with history of benzodiazepine treatment * patient with history of general anesthesia in the last 3 months before inclusion * patient with history of head trauma * Pregnant woman * breast feeding woman * Adults under supervision or guardianship

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Conditions

The condition(s) this trial relates to.

cannabis dependence

As listed by the trial registrant

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

Cannabis dependence

Contacts and locations

Locations

  • Study site

    Strasbourg, Bas-Rhin, 67300, France

More trials for these conditions

Other studies related to the condition(s) this trial covers.