how the eye works
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.
To see the parts of the eye, click here.
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,
contact lenses, or refractive surgery (like LASIK), 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.
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 by Dr. Dodge will identify causes that may affect your ability to see well. He
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.
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.
To see the parts of the eye, click here.
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,
contact lenses, or refractive surgery (like LASIK), 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.
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 by Dr. Dodge will identify causes that may affect your ability to see well. He
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.
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