Objective To observe the preventive effect of artificial tears on ocular surface damage due to anti-glaucoma medicine. Methods All 50 patients( 50eyes) with primary open angle glaucoma and local anti-glaucoma drugs were selected and randomly divided into observation group and control group,25 patients in each group,the patients in control group were only given anti-glaucoma medicine,the observation group given anti-glaucoma medicine and artificial tears. All patients were evaluated intraocular pressure( IOP...