Images are received at the back of the eye.

The images are transmitted across the Retina to the Optic Disc, and on to the brain.

Glaucoma involves the depressing of the Retina at the Optic Disc.

This reduces the impulses travelling to the brain ...

... which leads to a loss of vision ...

... and eventually total blindness.

Normally, fluid flows around the lens at the front of the eye.

If this flow reduces or stops, pressure builds up.

Sometimes this pushes the vitreous against the Retina, depressing the Optic Disc.

Eye drops can usually help get the fluid flowing again and reduce the pressure.