|
|
  |
Vision
Correction:
ANATOMY
& FUNCTION OF THE EYE
Eye
Function
The eye
works much like a camera. Like the eye, a camera produces images by
focusing light to create a visual impression on film. In vision,
light enters the eye through the cornea, which with the lens focuses
the image onto the retina where it is then transferred to the brain
via the optical nerve. The eye’s ability to focus on objects
up-close is accomplished by tensing or relaxing the muscles of the
lens in the eye. However, with age, these muscles lose power,
making near vision – the ability to see things up-close –
difficult without the aid of reading glasses. |
|
1.
Conjunctiva
This is
the transparent covering of the eye that lies between the eyelid
and the front
of the eye.
2. Cornea
This is
the window of the eye where the majority of focus takes place.
3. Iris
Actually
classified as a muscle, the iris is the colored portion of the eye
that adjusts
the amount of light allowed to enter into the eye.
4. Pupil
This is
the black spot in the center of the eye where light enters. Pupil
size changes
when the iris tenses or relaxes depending on the amount of light
present.
5. Lens
Located
behind the pupil, the lens is the secondary mechanism of focus after
the
cornea, adjusting the amount focus the light image requires before
it reaches the
retina.
6. Vitreous
This is
the gel that fills the eye and allows it to maintain its shape.
It also serves as a
clear pathway for light when it travels from the lens to the retina.
7. Optic
Nerve
This is
the pathway between the eye and the brain along which the signals
produced
by the retina travel to the brain.
8. Retina
The retina
is the nerve center of the eye where light is converted into an
electrical
signal that travels along the optic nerve to the brain.
|
|
