eye structure Flashcards
cornea
-description
-purpose
-transparent covering of eye
-protects eye
sclera
-description
-purpose
-white part of eye
-provides protection and support
retina
-description
-purpose
-layer of sensitive cells (photoreceptors) at back of cells
-detects light ray- focused by cornea and lens
choroid
–description
-purpose
-layer of blood vessels with black pigment
-nourishing the eye absorbing light
iris
-description
-purpose
-ring of muscles around pupil coloured part
-controls amount of light
pupil
-description
-purpose
-hole in the middle of iris
-allows light to enter eye
lens
-description
-purpose
-transparent and flexible can change shape due to ciliary muscles
-focuses light on to retina and focuses on objects
ciliary body
-description
-purpose
-attached to the underside of the lens
-producing aqueous humor and helps with focusing
vitreous humor
-description
-purpose
-located behind lens
-giving the eyeball its shape
aqueous humor
-description
-purpose
-found behind the cornea
-helps keep rounded shape; provides nutrients to cornea and lens
lateral rectus muscle
-description
-purpose
-found on latera side of eye
-helping orientate the pupil away from centre of body
medial rectus muscle
-description
-function
-found on medial side of the eye
-helping orientate the pupil away from the centre of the body
fovea
-description
-purpose
-spot located in the macula which has a high density of cone cells
-gives sharp central vision light focuses on this spot by the lens
optic disc
-description
-purpose
- blind spot where there are no photoreceptors
-where the optic nerves leave the eye
optic nerve
-description
-purpose
-bundles of fibre
-relaying information from the retina and fovea to the brain
