Inclusion Criteria:  age no less than 18 years  best corrected visual acuity better than decimal 0.3  Exclusion Criteria:  secondary glaucoma  secondary hypertension glaucoma-related operation history pregnancy or lactation period uncooperative with retinal examination severe opacity with refracting media in eye severe retinal diseases and neuropathy congenital retinal optic nerve abnormality other systemic diseases that influence hypertension and glaucoma assessment