May be due to limbal vasculitis. Can occur without history of previous infections or dermatologic findings. May be diagnosed by demonstrating microbes within biopsied limbal conjunctiva vessels using immunoprobes. Which of the following is not true about Terrien's marginal degeneration Idiopathic, essentially non-inflammatory peripheral corneal thinning Women are affected three times more likely than men . Usually painless without epithelial ulceration.
Corneal thinning begins superiorly, progress slowly, and can perforate with minor trauma.
May be associated with vascularized corneal pannus and lipid deposition 5. Usually caused by a diagnosable systemic disease. Classically presents with scleritis. Unilateral type may be effectively treated with local medical or surgical therapy. Ulceration with a characteristic overhanging edge usually starts at the interpalpebral fissure and progesses circumferentially and centrally.