Question:easy
Munson's sign is a feature of?
Munson's sign is a feature of?
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Lower-lid bulges into a V on downgaze due to a cone-shaped cornea.
Updated On: Jun 24, 2026
- Keratoconus
- Corneal ulcer
- Pterygium
- Posterior staphyloma
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Trace the sign to its mechanism. Munson's sign needs a cornea shaped like a cone, which is exactly what occurs in keratoconus.
Step 2: When the patient with keratoconus looks down, the protruding apex pushes the lower lid into a sharp angular bulge, and that lid contour is Munson's sign.
Step 3: Keratoconus also gives a Fleischer ring, an oil-drop reflex, a scissor retinoscopy reflex and progressive irregular astigmatism, all consistent with a thinning ectatic cornea beginning around puberty.
Step 4: A corneal ulcer causes an infiltrate, pterygium a fleshy conjunctival growth, and posterior staphyloma a backward scleral bulge - none indents the lid on downgaze. Hence the diagnosis is keratoconus.
\[\boxed{\text{Keratoconus}}\]
Step 2: When the patient with keratoconus looks down, the protruding apex pushes the lower lid into a sharp angular bulge, and that lid contour is Munson's sign.
Step 3: Keratoconus also gives a Fleischer ring, an oil-drop reflex, a scissor retinoscopy reflex and progressive irregular astigmatism, all consistent with a thinning ectatic cornea beginning around puberty.
Step 4: A corneal ulcer causes an infiltrate, pterygium a fleshy conjunctival growth, and posterior staphyloma a backward scleral bulge - none indents the lid on downgaze. Hence the diagnosis is keratoconus.
\[\boxed{\text{Keratoconus}}\]
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