The image above shows a patient presenting with a sudden onset of a bright red patch on the white of the eye, without pain or visual disturbance. What is the most likely diagnosis?

Explanation

## Image Findings * A **bright red, well-demarcated patch of blood** is observed beneath the bulbar conjunctiva, primarily in the temporal aspect of the eye. * The **conjunctiva overlying the hemorrhage appears intact and transparent**, allowing the blood to be clearly visible. * There are **no signs of inflammation** such as purulent discharge, significant lid swelling, or diffuse conjunctival injection beyond the area of hemorrhage. * The **cornea and visible portion of the iris/pupil appear clear and normal**, indicating no intraocular involvement. ## Diagnosis **Key Point:** The image demonstrates a **subconjunctival hemorrhage**, characterized by a bright red, well-demarcated collection of blood under the conjunctiva, typically without pain or visual disturbance. A subconjunctival hemorrhage occurs when a small blood vessel (capillary or arteriole) beneath the conjunctiva ruptures, leading to blood extravasation into the potential space between the conjunctiva and the sclera. It often appears alarming due to its bright red color but is usually benign and self-limiting. Common causes include Valsalva maneuvers (coughing, sneezing, straining), trauma, hypertension, or anticoagulant use. ## Differential Diagnosis | Feature | Subconjunctival Hemorrhage | Acute Conjunctivitis | Scleritis | | :---------------------- | :-------------------------------------------------------- | :-------------------------------------------------------- | :-------------------------------------------------------- | | **Appearance** | Bright red, well-demarcated patch of blood, often sectoral | Diffuse conjunctival injection (pink/red eye), often bilateral | Deep violaceous hue, localized or diffuse, often sectoral | | **Pain** | Usually none | Mild irritation, itching, foreign body sensation | **Severe, boring pain**, often radiating to head/face | | **Discharge** | None | Watery, mucoid, or purulent | None | | **Vision** | Unaffected | Usually unaffected | May be reduced, photophobia | | **Pupil/Cornea** | Normal | Normal | May have corneal involvement (keratitis) | | **Palpation** | Non-tender | Non-tender | **Marked tenderness** | ## Clinical Relevance **Clinical Pearl:** Subconjunctival hemorrhage is a common and usually benign condition. While often spontaneous, it's important to inquire about recent trauma, coughing/straining episodes, use of anticoagulants, and history of hypertension, especially in recurrent cases. ## High-Yield for NEET PG **High-Yield:** Subconjunctival hemorrhage is typically **painless** and **does not affect vision**. Its resolution is spontaneous, usually within 1-2 weeks, as the blood is absorbed. **Key Point:** The blood is **under the conjunctiva**, not in the anterior chamber (hyphema) or within the scleral tissue (scleritis). ## Common Traps **Warning:** Do not confuse subconjunctival hemorrhage with more serious causes of red eye, especially those involving pain, visual changes, or corneal involvement. The absence of these symptoms is crucial for differentiating it from conditions like acute angle-closure glaucoma, uveitis, or scleritis. ## Reference [cite:Kanski's Clinical Ophthalmology, 9th Edition, Chapter 4: The Conjunctiva]