What may occur if a chalazion is large enough?

• A. Blurred vision due to pressure against the eyeball.
• B. Double vision due to extraocular muscle involvement.
• C. Eye redness without vision change.
• D. Temporary loss of color vision.

Answer: (A)

A chalazion is a blockage and inflammatory lump of a meibomian gland in the eyelid. If it grows large enough, it can press on the cornea and subtly alter its shape, causing refractive changes (often astigmatism) and resulting in blurred vision. This mechanical effect on the cornea is why vision can be affected with a sizable chalazion. Diplopia would require involvement of the eye muscles or ocular misalignment, which a lid lesion typically does not cause. Redness might occur from irritation but does not inherently change vision, and temporary color vision loss is not a feature of a chalazion. So blurred vision from corneal distortion is the most likely consequence of a large chalazion.