Eye Flashcards
Cornea
Refracts light into the eye
Oxygen diffuses in from the outer surface
Conjuctiva
Lubricates and protects the surface of the eye
Iris
Controls diameter of pupil and hie much light enters the eye
The optic nerve
Carries impulses from the receptors in the brain
Lens
Focuses the light on the retina
What is the retina covered in
The retina is covered in light receptors called RODS and CONES
When you look at near objects
The ciliary muscles contract which slackens the suspensory ligaments
The lens becomes fat
To look at distant objects
The ciliary muscles relax which allows the suspensory ligaments to pull tight
This makes the lens go thin
What happens to your eyes in dim light
The brain tells the radial muscles to contract making the pupil bigger so to absorb more light
What happens to your eye in bright light
The circular muscles contract making the pupil smaller allowing less light in
If you are long sighted
You can’t focus on near objects
