Most cases seem to be caused by chronic conjunctivitis, especially secondary to feline herpesvirus.

Later, he got a job helping a neighbor who had leg problems; he delivered coal for the neighbor and, as a result, developed chronic conjunctivitis.

Potentially a cosmetic problem, the ocular telangiectasia do not bleed or itch, though they are sometimes misdiagnosed as chronic conjunctivitis.

Treatment (surgery) is only recommended if there is chronic conjunctivitis or if there is corneal damage.

Most cases are caused by a genetic predisposition, but chronic conjunctivitis, canine distemper, and drugs such as sulfasalazine and trimethoprim-sulfonamide also cause the disease.

While at the Pasteur Institute, Morax discovered the bacillus- Moraxella lacunata, the cause of chronic conjunctivitis.

Other forms of dry eye are associated with aging, poor lid closure, scarring from previous injury, or autoimmune diseases such as rheumatoid arthritis and Sjögren's syndrome, and these can all cause chronic conjunctivitis.

Ligneous conjunctivitis is a rare form of chronic conjunctivitis characterized by recurrent, fibrin-rich pseudomembranous lesions of wood-like consistency that develop mainly on the underside of the eyelid (tarsal conjunctiva).

Chronic conjunctivitis (e.g. trachoma) and aging factor are two causes of conjunctival concretion, which will make the conjunctiva cellular degeneration to produce an epithelial inclusion cyst, filled with epithelial cells and keratin debris.