Plain-English translation of NCT02804438 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
Doctors use a special device called a pupillometer to measure how patients' pupils respond — this can help spot problems with the brain or nervous system. Right now, doctors don't have a clear picture of what 'normal' pupil measurements should be in critically ill patients. This study is collecting pupil measurement data from patients already getting regular pupil checks in intensive care units, so researchers can build a reference guide that helps doctors better understand what the measurements mean.
When patients are critically ill, doctors need reliable information to know whether pupil measurements are normal or concerning. Without a solid reference database, it's hard for doctors to interpret what they're seeing and make the best treatment decisions.
You likely qualify if…
You likely don't qualify if…
If you qualify, researchers will simply collect data from the pupil measurements your medical team is already performing as part of your regular intensive care. You won't need to do anything extra — the study is purely observational, meaning doctors will record information from your existing pupil assessments using the pupillometer device. There are no additional procedures or visits required beyond your normal care.
AI-generated summary from trial data · Jun 4, 2026 · Not medical advice
United States
Enrollment target
~1,000 participants
Started
July 2015
Primary completion
September 2028
Last updated on clinicaltrials.gov in October 2025.
Reach out to the team running this trial. Response times vary — some teams are faster than others.
Central contact
DaiWai M Olson, PhD
University of Texas Southwestern Medical Center
Tell us you're interested and we'll help connect you with the research team. We'll walk you through what to expect first — no email needed to get started.