Glossary
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Optic nerve
The optic nerve carries information about what the eye sees to the brain. It is like an electric cable and contains around a million nerve fibres. Glaucoma causes nerve fibres to die and it is the death of nerve fibres which causes loss of vision. The optic nerve starts at the back of the eye at the optic nerve head (also called the optic disc). It is thought that the damage in glaucoma occurs at the optic nerve head.
The optic nerve leaves the eye through its supporting structure the lamina cribrosa and ends in the visual cortex of the brain.
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