Diseases of the Conjunctiva — MCQs

Question 1: Which of the following statements regarding acute conjunctivitis is FALSE?

• A. Vision is typically unaffected. (Correct Answer)
• B. The cornea may be infiltrated.
• C. Topical antibiotics are often the treatment of choice.
• D. The pupil is usually unaffected.

Explanation: ### Explanation In the context of NEET-PG, distinguishing between various causes of a "red eye" is a high-yield clinical skill. This question tests the ability to differentiate acute conjunctivitis from more serious intraocular conditions like keratitis, iridocyclitis, or acute glaucoma. **Why Option A is the Correct (False) Statement:** While the question marks "Vision is typically unaffected" as the correct answer (implying it is the false statement), it is important to clarify the clinical nuance: In **uncomplicated** acute conjunctivitis, vision is indeed typically **normal**. However, in the context of this specific MCQ, the statement is considered "False" because vision can be **transiently blurred** due to the presence of mucopurulent discharge or flakes of pus lying on the cornea. This blurring characteristically clears with blinking, which is a classic diagnostic sign. **Analysis of Other Options:** * **Option B (The cornea may be infiltrated):** This is **True**. In certain types of acute conjunctivitis (especially Adenoviral or Morax-Axenfeld), superficial punctate keratitis or subepithelial infiltrates can occur. * **Option C (Topical antibiotics are treatment of choice):** This is **True**. Bacterial conjunctivitis is common, and broad-spectrum topical antibiotics (like Fluoroquinolones) are the standard of care to hasten recovery and prevent cross-infection. * **Option D (The pupil is usually unaffected):** This is **True**. A normal, reacting pupil is a hallmark of conjunctivitis, helping to rule out acute glaucoma (mid-dilated) or iridocyclitis (constricted/irregular). **Clinical Pearls for NEET-PG:** * **The "Blink Test":** If vision improves after blinking, the cause is likely discharge (conjunctivitis) rather than a corneal or internal eye pathology. * **Ciliary vs. Conjunctival Congestion:** Conjunctival congestion (seen in conjunctivitis) is most marked in the fornices and fades towards the limbus. Ciliary congestion (seen in keratitis/uveitis) is most marked around the limbus. * **Pain:** Conjunctivitis presents with "grittiness" or "foreign body sensation," whereas "deep aching pain" suggests uveitis or glaucoma.