Acute Persistent Visual Loss: Keratitis
What causes it?
Infection, inflammation, trauma and drying. They cause opacification or erosion of the cornea. Blurred vision is usually sudden, and accompanied by pain, foreign-body sensation, and an hyperemic conjunctiva.
What to do?
Refer within 24 hours unless the cause is a mild abrasion of foreign body that you can remove.
To learn more, go to Red Eye: Keratitis.