How Caffeine and Alcohol Affect Your Eyes
Treatments studied
This study measures how caffeine and alcohol change the size of your pupils (the dark circles in your eyes). Researchers want to understand how these common substances affect your eye's natural responses, which could help with vision and neurological research.
Summary written for real people, not researchers, by Clin2.
Who can take part
- Be between 30 and 50 years old
- Have good vision (corrected or natural) in both eyes—at least 20/25 sharpness
- Be willing to drink both caffeine and alcohol as part of the study
- Not have eye diseases affecting the pupils (such as glaucoma, macular degeneration, or abnormal pupil shape)
- Not have serious brain or nerve conditions (like stroke, brain injury, or nerve disease)
- Not take medications that interact with caffeine or alcohol, or cause drowsiness
Quick eligibility check
Answer a few plain-language questions, based on this study's own requirements, to get a preliminary sense of fit.
Similar studies
Other trials that look related to this one.
This study uses eye-tracking technology to see how people pay attention to alcohol warning labels. It may help improve how warnings are designed to be more effective.
This study uses brain scans to see how caffeine affects the way we learn from rewards and punishments. You may be eligible if you are a healthy adult who drinks a moderate amount of caffeine daily.
This study tests whether a small dose of caffeine placed under the tongue helps older adults wake up faster and feel less confused after eye surgery under general anesthesia. Researchers want to see if this simple approach can improve how quickly patients recover and reduce post-surgery agitation.
This study looks at how glaucoma affects your body's natural light sensing, which can impact sleep, alertness, mood, and memory. Researchers compare people with glaucoma to healthy volunteers to understand these effects better.
This study looks at how your pupils react to light in healthy people. It may help doctors understand normal eye responses, which could improve future eye tests.
This study looks at how your eyes react to light and how that relates to your sleep and body clock. By participating, you help researchers understand how light affects sleep and daily rhythms.
Hear when a new Caffeine trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.