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Conjuctiva
A clear membrane that covers the white of the eye and the inside of the eyelids; it lubricates the eye and provides protection from external irritants
Cornea
Transparent, curved layer at the front of the eye that refracts light as it enters the eye
Sclera
The strong outer wall of the eyeball that helps to keep the eye in shape and provides a place of attachment for the muscles that move the eye
Pupil
Circular opening in the centre of the iris that allows light to enter the eye
Iris
Controls how much light enters the pupil
Lens
Transparent disc that can change shape to focus light onto the retina
Ciliary muscle
A ring of muscle that contracts and relaxes to change the shape of the lens
Suspensory ligaments
Ligaments that connect the ciliary muscle to the lens
Retina
Contains receptor cells sensible to light
Fovea
Region of the retina that contains densely packed cones (allows eyes to see in good detail and colour)
Optic nerve
Carries impulses between the eye and the brain
Blind spot
The point at which the optic nerve leaves the eye, where there are no light receptor cells