functions of the eye Flashcards
what does the sclera do
protects the eye from injury
what is the structure of the sclera
white
tough layer
what does the cornea do
refracts the light
bends it as it enters the eye
what is the structure of the cornea
clear area of the sclera
iris function
alters the size of the pupil
controls the amount of light entering the eye
what does the retina contain
light receptor cells
function of the retina
detect light and send signals to the brain through the optic nerve.
what are the two types of retina
rods and cones
what do rods help with
seeing in dim light as they are more sensitive
what do cones do
produce colour vision
what does there optic nerve do
carries impulses between the retina and the brain
what is the structure of the choroid
pigmented middle layer with many blood vessels
what does the choroid do
absorbs light to avoid reflection and nourishes the retina
what is the blind spot
Where the optic nerve leaves the retina so lacks receptor cells.
what is the pupil
Small hole at the centre of the iris through which light enters the eye.
