Our ability to "see" starts when light reflects off an object
at which we are looking and enters the eye. As it enters the eye, the light is
unfocused. The first step in seeing is to focus the light rays onto the retina,
which is the light sensitive layer found inside the eye. Once the light is focused,
it stimulates cells to send millions of electrochemical impulses along the optic
nerve to the brain. The portion of the brain at the back of the head interprets
the impulses, enabling us to see the object.
Light, refraction and its importance.
Light entering the eye is first bent, or refracted, by the cornea -- the clear
window on the outer front surface of the eyeball. The cornea provides most of
the eye's optical power or light-bending ability.
After the light passes through the cornea, it is bent again -- to a more finely
adjusted focus -- by the crystalline lens inside the eye. The lens focuses the
light on the retina. This is achieved by the ciliary muscles in the eye changing
the shape of the lens, bending or flattening it to focus the light rays on the
retina.
This adjustment in the lens, known as accommodation, is necessary for bringing
near and far objects into focus. The process of bending light to produce a focused
image on the retina is called "refraction". Ideally, the light is "refracted,"
or redirected, in such a manner that the rays are focused into a precise image
on the retina.
Most vision problems occur because of an error in how our eyes refract light.
In nearsightedness (myopia), the light rays form an image in front of the retina.
In farsightedness (hypermetropia), the rays focus behind the retina. In astigmatism,
the curvature of the cornea is irregular, causing light rays to focus to more
than one place so that a single clear image cannot be formed on the retina,
resulting in blurred vision. As we age, we find reading or performing close-up
activities more difficult. This condition is called presbyopia, and results
from the crystalline lens being less flexible, and therefore less able to bend
light.
Since changing the apparent refraction of the eye is relatively easy through
the use of corrective spectacle or contact lenses, many of the conditions that
contribute to unclear vision can be readily corrected.
How do we make sense of light?
Sensory interpretation
Even with the light focused on the retina, the process of seeing is not complete.
For one thing, the image is inverted, or upside down. Light from the various "pieces"
of the object being observed stimulate nerve endings -- photoreceptors or cells
sensitive to light -- in the retina.
Rods and cones
Two types of receptors -- rods and cones -- are present. Rods are mainly found
in the peripheral retina and enable us to see in dim light and to detect peripheral
motion. They are primarily responsible for night vision and visual orientation.
Cones are principally found in the central retina and provide detailed vision
for such tasks as reading or distinguishing distant objects. They also are necessary
for color detection. These photoreceptors convert light to electrochemical impulses
that are transmitted via the nerves to the brain.
Millions of impulses travel along the nerve fibers of the optic nerve at the
back of the eye, eventually arriving at the visual cortex of the brain, located
at the back of the head. Here, the electrochemical impulses are unscrambled
and interpreted. The image is re-inverted so that we see the object the right
way up. This "sensory" part of seeing is much more complex than the refractive
part -- and therefore is much more difficult to influence accurately.
What is 20/20 Vision?
You may be pleased to hear that you have 20/20 vision and think you have perfect
vision. But do you?
Not necessarily. 20/20 only indicates how sharp or clear your vision is at
a distance. Overall vision also includes peripheral awareness or side vision,
eye coordination, depth perception, focusing ability and color vision.
20/20 describes normal visual clarity or sharpness measured at a distance of
20 feet from an object. If you have 20/20 vision, you can see clearly at 20
feet what should normally be seen at that distance. If you have 20/100 vision,
it means that you must be as close as 20 feet to see what a person with normal
vision can see at 100 feet.
Is 25/25 vision better than 20/20?
No. 25/25 means normal sharpness of vision, or visual acuity, at 25 feet just
as 20/20 indicates normal vision at 20 feet.
Why do some people have less than 20/20?
The ability to see objects clearly is affected by many factors. Eye conditions
like nearsightedness, farsightedness, astigmatism or eye diseases influence
visual acuity. Most people with vision slightly below 20/20 function very well,
whereas some people who have better than 20/20 vision feel that their vision
is not satisfactory. Everybody's visual expectations are different and satisfactory
vision is far more complex than just being able to see 20/20.
If my vision is less than optimum, what can I do?
A comprehensive eye examination will identify causes that may affect your ability
to see well. We may be able to prescribe glasses, contact lenses or a vision
therapy program that will help improve your vision. If the reduced vision is
due to an eye disease, the use of ocular medication or other treatment may be
needed. If necessary, referral will be undertaken if an eye disease is found
which warrants further investigation.
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