The polycarbonate ring is similar to a symblepharon ring with an inner diameter of 16 mm and an outer diameter of 21 mm. ProKera is placed in the eye in a similar fashion to a large contact lens.

Corneal disease is the primary cause of visual loss in allergic eye disease. It occurs almost exclusively in vernal keratoconjunctivitis and atopic keratoconjunctivitis. It is characterized by ...