Eye, Function Flashcards
What does the Cornea do?
It refracts (Bends) light as it enters the eye
What does the Iris do?
It controls how much light enters the pupil
What does the Lens do?
It focuses light onto the retina
What does the Retina do?
It contains the light receptors
What does the Optic Nerve do?
It carries impulses between the eye and the brain
What do Rod Cells do?
They allow us to see in dimly lit areas
What do Cone Cells do?
They allow us to pick up colour
What is the way of remembering the function of Cone cells?
There are coloured cones in sport
How many sets of muscles are there in the Iris?
2
Which are they?
Circular Muscles & Radial Muscles
What happens to the Radial Muscle when the Circular Muscle contracts?
It expands
What happens to the Radial Muscle when the Circular Muscle relaxes?
It contracts
What happens when a pupil dilates?
It expands to allow more light in
What happens when a pupil constricts?
It shrinks to allow less light in
What happens to the eye in bright light?
- Radial muscles of the iris relax.
- Circular muscles of the iris contract.
- Less light enters the eye through the contracted pupil.