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Human eye - Coggle Diagram
Human eye
Parts of the eye
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Sclera
Outermost white covering layer
Protects the eyeball from mechanical damage
Gives eye the shape
Choroid
Middle layer with black pigments and blood vessels
Prevents eyeball from mechanical damage and gives eye the shape
Provides oxygen and nutrients to the eye
Retina
Innermost layer containing photoreceptors
Allows image to be formed
Fovea
A shadow, yellow depression
Images are sharply focused
Blind spot
Allows neurons to enter eye
Brings message to the brain
Contains optic nerve
Iris
Lying in front of the lens
Ring of muscles surrounding pupil
Controls the amount of light entering the eye
Changing the size of the pupil
Change the size of the pupil
Pupil
Contract and relax
Allow different light intensity to enter
Change the size of the pupil
A hole in the centre of the iris
Lens
Transparent, circular, biconvex, elastic
Retracts light onto retina
Changes shapes and thickness
Muscles in the eye
Ciliary
Contracts and relax
Controls curvature or thickness of the lens
Suspensory ligament
Attaches lens to ciliary muscle
Holds lens in place
Slacken or taut
Pupil reflex
Light enters and falls on the retina
Reflex action of the pupil due to changes in light intensity
Pupils can change the size
Controls the amount of light entering the eye
Focused image of retina
Prevent eye damage
Retina detects light intensity and generate nerve impulse
Impulse is transferred to a optic nerve
Sensory neurone
Passed to the brain
Transferred to the relay neuron
Transmits impulses
Sent to the motor neuron
Circular and radial muscles of iris
Contracts and relax
Increase or decrease the size of pupil