Chapter 6 extra Flashcards
What is vision?
Vision is how we see
What is weird about how we see?
Vision uses our brains much more than our eye balls
Where does light energy enter the eye?
Light energy enters the eye via the cornea
Where does light pass through?
Light passes through the pupil
What can the pupil do?
The pupil can expand and contract
Why does the pupil expand and contract?
The pupil expands and contracts to adjust the amount of light entering the eye
What helps focus the image?
the lens helps to focus the image
Where does light finally hit?
The light finally hits the retina at the back of the eye.
What does the retina have?
The retina has two types of cells: Cones and Rods
What are cone cells?
Cone cells are heavily involved in colour vision.
Where are cones found?
Cones are found in the area called the fovea, which is the center of the retina
Where is the fovea?
The fovea is in the center of the retina
When the viewer is looking directly at something, where does the image land on the back of the eye?
The image lands on the fovea when someone is looking at something directly
What are rods for?
Rods are important for black and white viewing.
Where are rods found?
Rods are mostly at the edge of the retina
Where does information from the rods and cones go?
The rods and cones send information through the optic nerves
What is the optic chiasm?
The optic chiasm is where the optic nerves cross before the enter the brain.
Why do the optic nerves cross?
The optic nerves cross so that the brain gets information from both eyes
Where does the information travel after the optic chiasm?
Lateral Geniculate nucleus (LGN) to the primary visual cortext (V1) and then to the occipital lobe
What happens to the image when it enters the eye?
Because it is a reflection it is flipped upside down and reversed, so the brain has to put it the right way up.
