- Rheumatoid arthritis
- Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitidies:
- Systemic lupus erythematosus
- Relapsing polychondritis
PUK affects 3 persons per million per year. There is no predilection by sex, but PUK more commonly affects patients after their fourth or fifth decade.
Patients present with ocular redness, pain, tearing, photophobia, and decreased vision. The classic presentation is a crescent-shaped white ulcer on the peripheral edge of the cornea.
Cases are mostly unilateral but can be bilateral. About 36%-66% of PUK cases can be associated with a scleritis, and a wider incidence of cases can be associated with anterior uveitis. The worst complications of PUK are corneal perforation or scleral perforation from an associated necrotizing scleritis. These complications need immediate surgical intervention to prevent infection and vision loss.