RT Journal Article SR Electronic T1 Red eye for the internist: When to treat, when to refer JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 137 OP 144 VO 75 IS 2 A1 Galor, Anat A1 Jeng, Bennie H. YR 2008 UL http://www.ccjm.org/content/75/2/137.abstract AB When a patient presents with redness in the eye, the cause needs to be diagnosed quickly. Some of the diseases that cause redness in the eye can be initially managed by an internist, but others call for quick referral to an ophthalmologist. This article reviews the spectrum of conditions manifesting as a red eye, emphasizing how to differentiate between the benign and the vision-threatening.