The Eye Flashcards
What is the function of the eye ?
vision , finding food , finding a mate , avoidance of predators , assessing situations / landscapes for locomotion , communication
What are rods responsible for?
black and white vision
Rods are sensitive to small amounts of light and allow animals to see at night.
Animals with good night vision have a higher amount of rods
Some animals that are nocturnal only have rods .
What are cones responsible for?
color vision
Cones respond to different light wave lengths
Animals and humans with good vision have high proportion of cones
What is the blind spot ?
Where the optic nerve joins the eye and there are no rods and cones
How does the eye form images ?
Cornea - lens system refracts light ,
The image is inverted and reduced in size and focused onto the retinal surface
The photoreceptors on the retina are stimulated by the light produced by the cornea lens system ,
They produce electrical signals that are transmitted to the brain via the optic nerve .
