_:vb50953175 . _:vb50953175 . _:vb50953175 "url:http://www.mayoclinic.org/diseases-conditions/keratitis/basics/definition/con-20035288"^^ . _:vb50953175 "A corneal disease that is characterized by inflammation of the cornea."^^ . _:vb50953175 . _:vb50953175 . _:vb50953175 .