Most allergic conjunctivitis is mild, mustard can be congested and watery, itching with glazed eh, and generally there is a discharge or a small amount of discharge.
2 Catarrhal conjunctivitis
The onset is acute, often involving both eyes (or at intervals of 1 to 2 days), accompanied by a large amount of mucous secretions (eye droppings), which are secreted more at night, and often in the morning, the eyes are muddled by secretions. In mild cases, there is itching and foreign body sensation in the eyes; in severe cases, the eyelids are heavy, burning, photophobia and tearing, with subconjunctival congestion, edema, or small hemorrhages, and the eyelids are often red and swollen, and the cornea is involved with pain and blurred vision, which is similar to trachoma in some cases.
3 Macropapillary conjunctivitis
Macropapillary conjunctivitis is a non-infectious immune inflammatory reaction that primarily involves the upper lid conjunctiva. It is named after the presence of "giant" papillae (≥1.0 mm in diameter) on the surface of the upper lid conjunctiva.
4 Keratoconjunctivitis vernalis
Keratoconjunctivitis vernalis, also known as vernal cicatricial conjunctivitis and seasonal conjunctivitis, is a recurrent, bilateral, chronic ocular surface disease that accounts for 0.5% of all allergic ophthalmopathies, with an environmental and racial predisposition. It mainly affects children and adolescents and is more common in males under 20 years of age, and in severe cases it jeopardizes the cornea and can impair vision.