How much pressure is normal?

IOP is usually within 10 - 21 mm Hg.

IOP refers to the pressure of aqueous humor, lens, vitreous and other ocular contents on the eye wall and their mutual pressure, usually within 10 - 21 mmHg. IOP may be affected by eye use, position and other factors, resulting in fluctuations in intraocular pressure. If the intraocular pressure is greater than the normal range, it may be suffering from hypertension, glaucoma, cataracts and other diseases, belonging to abnormal conditions.