Learn the Eye Flashcards
What does the conjunctiva do?
Lubricates and protects the surface of the eye
What does the cornea do? What does it look like?
Refracts light into the eye. It is transparent and has no blood vessels to supply it with oxygen, so oxygen diffuses in from the outer surface
What does the iris do?
Controls the diameter of the pupil and therefore how much light enters the eye
What does the lens do?
Focuses the light onto the retina
What is the retina?
The light-sensitive part - it’s covered in light receptors called rods and cones
What are rods more sensitive in?
Dim light but can’t sense colour
What are cones more sensitive to?
Colours but aren’t good in dim light
Where are cones found?
All over the retina, but there are loads of them at the fovea
What does the optic nerve do?
Carries impulses from the receptors to the brain
