How Caffeine and Alcohol Affect Your Eyes
Treatments studied
Part of Eyes & vision clinical trials.
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 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 compares how caffeine changes eye measurements in people with primary open-angle glaucoma versus people without eye disease. It may help researchers understand whether caffeine intake could affect vision-related eye signals.
This study looks at how different colors of light change your pupil size. It may help us understand vision and eye health better.
This study uses a special eye scanner to see how changing your body position (like lying down or sitting up) affects blood flow in your retina and choroid. It may help doctors understand normal eye function better.
Hear when a new Caffeine trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.