How to explain the concept of glaucoma in layman’s terms The eye is similar to a closed container in which one tube is constantly feeding water (atrial aqueous production) and another tube is constantly discharging water (atrial aqueous discharge). Under normal conditions, the incoming water and outgoing water maintain a dynamic balance and the pressure in the container is normal. If the outlet tube is partially or completely blocked, the pressure inside the vessel increases, i.e., the intraocular pressure increases. The increased intraocular pressure will produce a series of lesions, which means that glaucoma occurs. The treatment of glaucoma is also known as a partial or complete blockage of the outlet tube and the use of drugs or surgery to open the tube or open another outlet tube.