Primary open-angle glaucoma is a kind of ophthamopathy also termed as chronic simple glaucoma. Its onset is because the chronic progressive obstruction of the aqueous humor leads to the increase of intraocular pressure or nervous lesion of the anterior segment.  The clinical manifestations of the diseases include opened and widened anterior angle, enlargement of ophthalmic cup, opic astrophy and visual field detect. The disease, often with obvious familial tendency, is usually found among people at the age of 20 to 60 and men patients are more than women ones.