Ocular ferning test. A qualitative test for mucus deficiency

A new qualitative test for the study of conjunctival mucus has been developed. Conjunctival scrapings were obtained from 196 patients. Microscopic mucus ferning (arborization) was observed in 148 (91%) patients with various forms of acute conjunctivitis. Six patients (18%) with cicatrizing conjunctivitis (diffuse conjunctival cicatrization, ocular pemphigoid, Stevens-Johnson syndrome) had mucus ferning in their conjunctival scrapings specimens. Mucus ferning was significantly absent (P <0.005) in patients with diffuse conjunctival cicatrization when compared to mucus ferning in other forms of conjunctivitis. Ocular mucus ferning test is a simple inexpensive office test for the evaluation of patients with mucus deficiency.