The Eye Flashcards
What type of organ is the eye?
A sense organ
What does the eye contain?
It contains receptors sensitive to light intensity and colour
What does the cornea do?
It refracts light and bends it as it enters the eye
What does the iris do?
It controls how much light enters the pupil
What does the lens do?
It further refracts light to focus it onto the retina
What does the retina contain?
It contains the light receptors
What does the optic nerve do?
It carries impulses between the eye and the brain
What does the sclera do?
It helps protect the eye from injury
What are the 2 main type of light receptors?
Rods and Cones
Which receptor is more sensitive to light?
The rods
Which receptor produces colour vision?
The cones
How types of cone cells are there?
3
When an object is distant, the ciliary muscles ___________.
relax
When an object is near, the ciliary muscles ___________.
contract
When an object is distant, the suspensory ligaments __________.
tighten
