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In page Corneal ulcer:
"Corneal ulcers are painful due to nerve exposure, and can cause tearing, squinting, and vision loss of the eye.[1][2] There may also be signs of anterior uveitis, such as miosis (small pupil), aqueous flare (protein in the aqueous humour), and redness of the eye. An axon reflex may be responsible for uveitis formation—stimulation of pain receptors in the cornea results in release inflammatory mediators such as prostaglandins, histamine, and acetylcholine.[citation needed]
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