Cannabis and driving: study probes how chronic use blurs vision of moving objects
NCT ID NCT01793961
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.
Disclaimer
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the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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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.
Contacts and locations
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Locations
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Study site
Strasbourg, Bas-Rhin, 67300, France