The Eye Flashcards
The ___________ does most of the focusing of light rays.
Cornea
The ________ contains ______ cells to detect low levels of light and ________ cells to detect colours in bright light
Retina
ROD
CONE
The amount of light entering the eye is controlled by _________ muscles in the ______ which constrict and ________ the ________.
Iris
Ciliary
Dilate
Pupil
The ______ fine - tunes the focusing of light.
Lens
What is the nerve that enters the eye?
Optic nerve
What can’t short sighted people see?
Distant objects are blurry
What can’t long sighted people see?
Close objects are blurry
How can you correct short sightedness?
Diverging lens
How can you correct long sightedness?
Converging lens
What cells cause colour blindness?
CONE cells
What causes cataracts?
The lens becomes cloudy (often comes from age)
How can you correct cataracts?
Replacing the cloudy lens with a clear one
What is the most common type of colour blindness?
Red - green
Is a long sighted persons eye to long or short?
Short
Is a short sighted persons eye to long or short?
Long
