Eye Redness & Conjunctivitis
Educational content • Medi Info HubUpdated: 10/19/2026
Overview
Red eye is caused by dilation of the superficial conjunctival and episcleral blood vessels. While commonly due to benign conjunctivitis, it can signify vision-threatening conditions such as uveitis, keratitis, or acute glaucoma.
Possible Causes
Adenovirus infection, contact lens overwear, seasonal allergens, foreign body irritation, ocular trauma, and dry eye disease.
When to Seek Care
See an optometrist or ophthalmologist if redness is accompanied by pain, thick pus discharge, or contact lens use.
The information provided on this website is for educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.