4.10 Flashcards
1
Q
How does light enter the eye.
A
Light enters the eye through the clear cornea, which slightly refracts light, then the lens which refracts the
light more.
2
Q
What is the iris?
A
The iris is the coloured part of the eye it can change size to increase/decrease the size of the pupil to
allow more/less light in
3
Q
What do muscles in the eye do?
A
Muscles in the eye control the shape of the lens, thereby changing the focal length allowing focus .
4
Q
What are rods and cones?
A
Rods and cones are sensors that detect light in the retina at the back of the eye.
5
Q
True or False: The image on the retina is inverted.
A
True: The image on the retina is inverted.
6
Q
What does the optic nerve do?
A
The optic nerve carries the visual messages to the brain.
