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Pericorneal injection is a ring of redness around the corneal edge caused by dilated deep conjunctival and episcleral vessels. The hue is violaceous and most intense at the limbus. It often points to inflammation of the cornea, iris, or ciliary body, and can appear in acute angle closure. Recognizing this pattern helps triage painful red eyes.
read more about pericorneal injection ...The flush is most visible near the limbus and fades toward the fornices. Vessels appear fine and do not blanch fully with topical vasoconstrictors. Photophobia, ache, or reduced vision may accompany the finding. Fluorescein staining and pressure checks clarify the cause.
The pattern points toward deeper inflammation instead of simple surface irritation. Pain and light sensitivity often narrow the diagnosis toward uveitic causes. Early detection helps prevent complications from spreading. Follow up testing confirms which structures are involved.
Common triggers include keratitis, anterior uveitis, and acute angle closure glaucoma. Corneal foreign bodies or ulcers can produce a focal variant. Chemical injury can also create a perilimbal ring. History and slit lamp exam narrow the list.
No, simple conjunctival injection is brighter and more diffuse, often from allergy or mild irritation. Pericorneal injection is deeper and more localized to the limbus. The difference guides urgency and workup. Painful eyes with perilimbal flush deserve prompt care.
Treatment targets the cause: antimicrobials for keratitis, steroids under supervision for uveitis, and pressure control for angle closure. Do not self start steroid drops in corneal infection. Protective shields and pain control support comfort. Follow up confirms resolution.
Can dry eye cause it? Dryness usually causes diffuse redness, not a perilimbal ring.
Is it contagious? Only if due to an infectious keratitis.
When should I seek help? Any severe pain, light sensitivity, or blur needs same day evaluation.
“Acute Anterior Uveitis.” EyeWiki (American Academy of Ophthalmology). https://eyewiki.org/Acute_Anterior_Uveitis. Updated January 18, 2026
“Uveitis.” StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK540993/. Published 2023
“An Update on Viral Conjunctivitis Treatment Strategies.” Shunmugam M, et al. (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC12388293/. Published 2025
“Conjunctivitis.” The Royal Australian College of General Practitioners (RACGP). https://www.racgp.org.au/afp/2024/november/conjunctivitis. Published November 2024
“Conjunctival Injection: What Is It, Causes, Diagnosis, and Treatment.” Osmosis. https://www.osmosis.org/answers/conjunctival-injection. Published 2023