Surfactants can be classified into cationic, anionic and nonionic ones. Benzalkonium chlorides are cationic surfectants and being widely used as a disinfectant and germicide using their strong protein-denaturing action. Especially in hospitals, 10 % solution of benzalkonium chloride mixture is being usually used; it is diluted to 0.05–0.1 % solution to be used for various types of disinfection. The drugs are contained in gargles and preservative solutions for contact lenses.
Allergic Conjunctivitis This condition is extremely common and often mistaken for infectious conjunctivitis. Itching, redness, and epiphora are typical. The palpebral conjunctiva may become hypertropic with giant excrescences called cobblestone papillae. Irritation from contact lenses or any chronic foreign body can also induce formation of cobblestone papillae. Atopic conjunctivitis occurs in subjects with atopic dermatitis or asthma.
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