_:vb50956830 . _:vb50956830 . _:vb50956830 "A corneal ulcer that is characterized by ulceration and opacification of the central cornea and is caused by minor trauma and subsequent infection by bacterial or mycotic organisms."^^ . _:vb50956830 "url:https://en.wikipedia.org/wiki/Corneal_ulcer"^^ . _:vb50956830 . _:vb50956830 . _:vb50956830 .