HOW DOES THE EYE WORK Flashcards
what does the outer cornea and lens do.
Refracts light rays
What does the retina contain.
light receptors some are sensitive to different colors,
What is accommodation.
This is when the eye focuses light from a disant or near object by altering the shape of its lens.
What does the eye do to focus on near objects.
Ciliary muscle contact - suspensory ligament slackens, so lens regain more rounded shape due to elasticity.
What does the eye do to focus on distant objects.
Ciliary muscle relax - suspensory ligament tightens, lens has less rounded shape.
Red-green colour blindness is caused by.
lack of specialised cells in retina.
Long and short sighed caused by what factor.
eyeball or lens being the wrong shape.
Why would an eye be long sighted.
Eyeball is too short.
Lens too thin.
So image focused behind retina.
Why would an eye be short sighted.
Eyeball is too long.
Lens too rounded - lens refract light too much.
So image focused in front of retina.
What does the pupil allow.
How much light rays entering the eyes.
coloured iris controls what.
The amount of light entering the eyes.
What does corneal surgery do. What does does convex and concave lens do.
It corrects long and short sightedness.
Convex - used to correct long sight.
Concave - used to correct short sight.
What does the ciliary muscle control.
suspensory ligament .
What is the job of the optic nerve.
To carry impulses back to the brain, and ultimately flip the image right way round.
