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The eye
parts of the eye
16
Physics
Undergraduate 2
04/30/2013

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Term
aqueous humor
Definition
a jelly-like substance located in the anterior chamber of the eye
Term
choroid
Definition
layer that is located behind the retina and absorbs unused radiation
Term
ciliary muscle
Definition
a ring-shaped muscle attached to the iris. It controls the shape of the lens
Term
cornea
Definition
a strong clear bulge located at the front of the eye. it contributes to the image forming process by refracting light entering the eye.
Term
fovea
Definition
is a small depression in the retina. this is the part in which high-resolution vision of of fine detail is possible
Term
hyaloid
Definition
this divides the aqueous humor from the vitreous humor
Term
iris
Definition
this is a diaphragm of variable size whose function is to adjust the size of the pupil to regulate the amount of light admitted into the eye
Term
lens
Definition
is a flexible unit that consists of layers of tissue enclosed in a tough capsule. it is suspended from the ciliary muscles by the zonule fibers
Term
optic nerve
Definition
this is the second cranial nerve and is responsible for vision.
Term
papilla
Definition
is also known as the blind spot and is located at the position from which the optic nerve leaves the retina
Term
pupil
Definition
the aperture through which light enters the eye. This is formed by the iris.
Term
retina
Definition
this may be described as the screen on which an image is formed by light that has passed into the eye. it also contains photosensitive elements (rods and cones) that convert the light they detect into nerve impulses that are then sent onto the brain along the optic nerve.
Term
sclera
Definition
is a tough white sheath around the outside of the eye-ball. this is what makes up the white of the eyeball.
Term
visual axis
Definition
a straight line that passes through both the centre of the pupil and the centre of the of the fovea
Term
vitreous humor
Definition
a jelly like substance
Term
zonules
Definition
attach the lens to the ciliary muscles
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