The eye Flashcards
What is the eye?
The receptor organ for visible light waves.
What happens when the eye receives a stimulus?
It transforms light waves into a nerve impulse. That nerve impulse is carried by the optic nerve and sensory nerves to the area of the brain responsible for visual processing
Describe the iris.
Provides colour and adjusts for amount of light to fall on the retina
Dilates (widens) to allow more light in through pupil
Contracts (narrows) to allow less light in through pupil
Describe the cornea.
Transparent outer layer which allows light to enter the eye.
Its curvature bends the light into the eye through the pupil.
Describe the lens.
Focuses light directly onto the eye retina.
Describe the retina.
Located in back of the eye.
Contains light receptor cells that transform light into nerve impulses that are then transmitted to the brain by the optic nerve
Describe the arrow thing (light to brain)
light eye retina optic nerve brain
