在眼用药物剂型方面,大多是眼药水和软膏。这二种剂型使用方便,全身性副作用较少。但它们还存在不少缺点:如眼药水滴入后易流出,眼角膜能抵抗药物的穿透、泪液循环又使药物与角膜接触时间很短,因此效果不易持久,必须每天滴入数次,这在治疗青光眼病人时尤为突出。眼药膏作用时间较长,但容易污染,又必须在临睡前使用。此外这二种剂型还得使用大量 In ophthalmic dosage forms, mostly eye drops and ointments. These two formulations are easy to use and have fewer systemic side effects. But they also have many shortcomings: such as eye drops easy to flow out after instillation, cornea can resist the penetration of drugs, tears and drug contact with the cornea and a very short time, so the effect is not easy to be lasting, it must be dropped several times a day, This is especially true when treating glaucoma patients. Ophthalmic ointment for a longer time, but easy to pollution, but also must be used before going to sleep. In addition, these two formulations have to use a lot