The eye

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GCSE Biology> Human Biology> The Eye
For GCSE biology you will need to learn a diagram of the eye and the main points, which include:
Retina - has rods which detect brightness and cones which detect colour.
Yellow spot - when you focus on an object, this is where the image falls. It is highly concentrated with rods and cones.
Blind spot - where the optic nerve leaves - there are no rods or cones so you can't see this point.
Optic nerve - takes impulses to the brain.
Cornea - protects the eye and also starts bending the light.
Pupil - small in bright light and large in dim. Controlled by muscles in the iris. This protects the retina from very bright light which could damage it.
Lens - bends the light and turns it upside down so it can be focused on the retina.
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