Blepharitis is the most common ocular finding in psoriasis. Erythema, edema, and psoriatic plaques may develop, and they can result in madarosis, cicatricial ectropion, trichiasis, and even loss of the lid tissue. A chronic nonspecific conjunctivitis is fairly common. It usually occurs in association with eyelid margin involvement. Psoriatic plaques can extend from the lid onto the conjunctiva.
Chronic conjunctivitis can lead to symblepharon, keratoconjunctivitis sicca, and trichiasis.
Nodular episcleritis and limbal lesions resembling phlyctenules also can be seen. Corneal involvement Corneal disease is relatively rare. Most often, it is secondary to lid or conjunctival complications, such as dryness, trichiasis, or exposure. The most common finding is punctate keratitis. Filaments, epithelial thickening, recurrent erosions, vascularization, ulceration, and scarring can occur.