It then flows through the pupil to the front chamber, and then out of the eye through small drainage channels. These channels are like a 'sieve' in the kitchen used to drain rice. As mentioned, treatment is aimed at lowering the pressure in your eye, so more blood can flow into the optic nerve. Eye drops Eye drops containing drugs can 'switch the tap' off that makes the fluid. This results in more blood entering the eye, and more blood flowing to supply the optic nerve.
Less fluid is made, so the eye is softer and lets more blood flow in to supply the nerve.
Occasionally an operation may be necessary. As part of the operation a small hole is made to let more fluid out of the eye. Your ophthalmic surgeon will discuss the pros and cons of the operation if it is necessary. A small hole is made at the top of the eye, under the eyelid, to let the fluid drain out of the eye. As a result, the eye becomes softer, and more blood can flow in.