The treatment principles of conjunctivitis focus on treating the cause, primarily administering local medications, with systemic medication when necessary, and washing the conjunctival sac. When there is a significant amount of secretion in the conjunctival sac, an non-irritating wash solution such as saline or 3% boric acid solution can be used for washing one to two times a day, to clear the secretions from the conjunctival sac. Care should be taken to avoid the washing solution from entering the healthy eye to prevent cross-infection.