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Anatomy of Eye
The Cornea
The Iris & Pupil
Aqueous Humour
Vitreous Humour
The Lens
The Retina
The Optic Nerve
Cillary Muscle

Eye Anatomy - The Optic Nerve

The optic nerve is a thick bundle of about 1.2 million individual nerve fibers. It travels from the retina to the brain’s vision centre, carrying electrical data that the brain will interpret as images.

The individual fibers come from the retina’s photosensitive cells – the rods and cones. These cells receive the light that travels into the eye through the cornea, the pupil, the lens and then the vitreous gel. They convert the light data to electrical data so that the nerve fibers can pick it up.

The optic nerve fibers travel across the retina and converge near its centre. Their convergence forms the optic nerve. At this location there are no light-sensitive cells, since the nerve fibres are taking up the space. This is the eye’sblind spot. It is near the macula, the retinal area giving us our sharpest, bright-light vision. We use it for reading or any close work where small details are important. Glucoma is diagnosed partly by the presence of damage to the optic nerve at a point called the cup, where the nerve leaves the retina.


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