Measles is an uncommon childhood illness these days, as more and more children receive vaccinations. However, some cases still occur. In countries where most children remain unvaccinated, measles is a leading cause of childhood blindness. Almost all children with measles develop conjunctivitis. Measles can also cause keratitis, which is a corneal infection that causes temporary blurred vision. Left untreated, ulcers and scarring can develop on the cornea, causing permanent vision loss. In rare cases, measles can cause optic neuritis -- inflammation of the optic nerve potentially leading to vision loss.

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