There are several symptoms of glaucoma at the beginning, but they are always ignored by people because of their long-term bad living habit and take it as normal.
There are many types of glaucoma because of different process of forming, but the pathology is the same, that is high intraocular pressure lead to blurred seeing, disgusting, constipation, even the worst blindness. People with hypertension, refraction errors and nervous tense are more likely to have glaucoma.
At the beginning the intraocular pressure is undulant during the day. It's beyond the normal standard only for a few hours, so it's necessary to test the intraocular pressure more times everyday, so that we can know about the changing curve of the pressure. Another way is the examination of ocular fundus, because the pathologic change of retinal nerve fiber layer is earlier than the defect of visual field, which is the most important symptom for glaucoma diagnosis.
