25/04/2026
Red eye is one of the most common presentations in eye care—but not all red eyes are created equal. Two key conditions that often get confused are Conjunctivitis and Uveitis. While one is usually mild and self-limiting, the other can threaten vision if missed.
🔴 What is Conjunctivitis?
Conjunctivitis is inflammation of the conjunctiva—the thin, transparent membrane covering the white part of the eye.
🧾 Key Clinical Features:
• Appearance:
Diffuse, bright redness across the sclera
Superficial blood vessels
Often associated with lid swelling
• Symptoms:
Itching (especially allergic)
Gritty or foreign body sensation
Watering, mild burning
Typically mild discomfort, not true pain
• Discharge:
Watery (viral/allergic)
Mucopurulent or purulent (bacterial)
Lids may stick together, especially in the morning
• Cause & Course:
Commonly viral, bacterial, or allergic
Usually self-limiting
Vision typically remains normal
👉 In short: Irritating, but not dangerous in most cases
⚠️ What is Uveitis?
Uveitis is inflammation inside the eye, involving structures like the iris, ciliary body, or choroid.
🧾 Key Clinical Features:
• Appearance:
Deep redness around the cornea (ciliary flush)
Vessels are deeper, giving a violaceous hue
Pupil may appear small or irregular
• Symptoms:
Severe, aching pain (often radiating)
Photophobia (light sensitivity)
Blurred vision
Tender eye
• Pupil Findings:
Constricted, irregular pupil
Sluggish or poor reaction to light
• Associated Signs:
Possible hypopyon (in severe cases)
Cells/flare in anterior chamber
• Cause & Risk:
Often linked with autoimmune conditions (e.g., HLA-B27)
Can lead to complications like glaucoma, cataract, or vision loss
👉 In short: Painful, deeper, and potentially vision-threatening
🚨 Why This Matters in Practice
Misdiagnosing uveitis as simple conjunctivitis can delay treatment—and that delay can cost vision.
Red flags you should never ignore:
• Photophobia
• Reduced vision
• Deep aching pain
• Irregular or small pupil
• No discharge despite redness
👉 These signs should immediately shift your thinking toward intraocular pathology.
🧠 Clinical Takeaway
• Conjunctivitis = Surface problem → Usually harmless
• Uveitis = Internal inflammation → Potential emergency
A careful look at pain, pupil, and pattern of redness can quickly guide you toward the right diagnosis.
💬 Final Thought
In eye care, subtle differences carry big consequences. A “simple red eye” can either be a minor irritation—or the first sign of something much deeper.
Train your eye to see beyond redness.
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