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Optometrists Cary NC |
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Cary Family Eye Care
10110 Green Level Church Rd
Suite 102, Cary, NC 27519
(919) 465-7400 |
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| Computer Vision Syndrome |
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Computer Vision Syndrome
describes a group of eye and vision-related
problems that result from prolonged computer
use. Many individuals experience eye discomfort
and vision problems when viewing a computer
screen for extended periods. The level of
discomfort appears to increase with the amount
of computer use. |
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The most common symptoms associated with
Computer Vision Syndrome (CVS) are |
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eyestrain |
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headaches |
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blurred vision |
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dry eyes |
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neck and shoulder
pain |
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The extent to which
individuals experience visual symptoms often
depends on the level of their visual abilities
and the amount of time spent looking at the
computer screen. Uncorrected vision problems
like farsightedness and astigmatism, inadequate
eye focusing or eye coordination abilities, and
aging changes of the eyes, such as presbyopia,
can all contribute to the development of visual
symptoms when using a computer.
Many of the visual symptoms experienced by
computer users are only temporary and will
decline after stopping computer work. However,
some individuals may experience continued
reduced visual abilities, such as blurred
distance vision, even after stopping work at a
computer. If nothing is done to address the
cause of the problem, the symptoms will continue
to recur and perhaps worsen with future computer
use.
Prevention or reduction of the vision problems
associated with Computer Vision Syndrome
involves taking steps to control lighting and
glare on the computer screen, establishing
proper working distances and posture for
computer viewing, and assuring that even minor
vision problems are properly corrected. |
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Proper body positioning for computer
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What causes Computer Vision
Syndrome? |
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Viewing a
computer screen often makes the eyes
work harder. As a result, the unique
characteristics and high visual
demands of computer viewing make
many individuals susceptible to the
development of vision-related
symptoms.
Viewing a computer screen is
different than reading a printed
page. Often the letters on the
computer screen are not as precise
or sharply defined, the level of
contrast of the letters to the
background is reduced, and the
presence of glare and reflections on
the screen may make viewing
difficult.
Viewing distances and angles used
for computer work are also often
different from those commonly used
for other reading or writing tasks.
As a result, the eye focusing and
eye movement requirements for
computer viewing can place
additional demands on the visual
system.
In addition, the presence of even
minor vision problems can often
significantly affect comfort and
performance at a computer.
Uncorrected or under corrected
vision problems can be major
contributing factors to
computer-related eyestrain. Even
people who have an eyeglass or
contact lens prescription may find
it's not suitable for the specific
viewing distances of their computer
screen. At greatest risk for
developing CVS are those persons who
spend two or more continuous hours
at a computer every day. |
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How is
Computer Vision Syndrome diagnosed? |
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Computer Vision Syndrome can
be diagnosed through a comprehensive eye
examination, with special emphasis on visual
requirements at the computer working distance.
Using the information obtained from these tests,
your optometrist can determine if you have
Computer Vision Syndrome and advise you on
treatment options. |
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How is
Computer Vision Syndrome treated? |
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Solutions to computer-related
vision problems are varied. However, CVS can
usually be alleviated by obtaining regular eye
care and making changes in how you view the
computer screen.
In some cases, individuals who do not require
the use of eyeglasses for other daily activities
may benefit from glasses prescribed specifically
for computer use. In addition, persons already
wearing glasses may find their current
prescription does not provide optimal vision for
viewing a computer. Lenses prescribed to meet
the unique visual demands of computer viewing
may be needed. Special lens designs, lens powers
or lens tints or coatings may help to maximize
visual abilities and comfort. |
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Some important factors in preventing or reducing
the symptoms of CVS have to do with the computer
and how it is used. This includes lighting
conditions, chair comfort, location of reference
materials, position of the monitor, and the use
of rest breaks.
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Location of computer screen -
Most people find it more comfortable
to view a computer when the eyes are
looking downward. Optimally, the
computer screen should be 15 to 20
degrees below eye level (about 4 or
5 inches) as measured from the
center of the screen and 20 to 28
inches from the eyes.
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Reference materials - These
materials should be located above
the keyboard and below the monitor.
If this is not possible, a document
holder can be used beside the
monitor. The goal is to position the
documents so you do not need to move
your head to look from the document
to the screen.
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Lighting -
Position the computer screen to
avoid glare, particularly from
overhead lighting or windows. Use
blinds or drapes on windows and
replace the light bulbs in desk
lamps with bulbs of lower wattage. |
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Anti-glare screens
- If there is no way to minimize
glare from light sources, consider
using a screen glare filter. These
filters decrease the amount of light
reflected from the screen.
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Seating position
- Chairs should be comfortably
padded and conform to the body.
Chair height should be adjusted so
your feet rest flat on the floor. If
your chair has arms, they should be
adjusted to provide arm support
while you are typing. Your wrists
shouldn't rest on the keyboard when
typing.
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Rest breaks
- To prevent eyestrain, try to rest
your eyes when using the computer
for long periods. Rest your eyes for
15 minutes after two hours of
continuous computer use. Also, for
every 20 minutes of computer
viewing, look into the distance for
20 seconds to allow your eyes a
chance to refocus.
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Blinking -
To minimize your chances of
developing dry eye when using a
computer, make an effort to blink
frequently. Blinking keeps the front
surface of your eye moist. If you
routinely experience dry eye at the
computer, talk to your optometrist.
There are many treatments available
for dry eye syndrome. |
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Regular eye
examinations and proper
viewing habits can help
to prevent or reduce the
development of the
symptoms associated with
Computer Vision
Syndrome. |
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