Unlike most other diseases, you often don’t notice you have glaucoma until the disease is very advanced.

The eye, being like a traditional camera with a lens and film (retina), is connected to the brain with an electrical cable (the optic nerve). This nerve / electrical cable degenerates gradually in everyone.

Unfortunately, it can degenerate more quickly than it should when the pressure within the eye is too high: this is glaucoma.

Commonly, the patient will only notice a change in their vision when almost all the nerve has been lost. This is because the brain has an extraordinary ability to compensate for optic nerve loss .

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