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Computer vision syndrome
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Computer vision syndrome
Dr. Makbul G. Mansuri
Over the last twenty years,
the pace of advance in electronic technology has been
breathtaking. From the first limited-use personal computers and
their fuzzy-imaged information exchange monitors (also known as
CRTs and VDTs), the industry has evolved to offer faster chips,
more capable software, higher storage capacity, the promise of the
Internet with on-line living and the tease of a paperless society.
The change in capability has been rapid and massive, but the
information exchange medium for the computer user has evolved only
a little. Now, we view slightly less fuzzy VDT monitors and liquid
crystal display (LCD) screens, which are still not at all friendly
to the human visual system. Twenty years ago, optometrists began
to hear the first murmurings of vision-related complaints from
their computer-using patients. Today, we hear the same array of
symptoms from a great many more patients, but we give the
impression to be no closer to a good set of reliable answers.
Computer vision syndrome (CVS) is a term that describes
eye-related problems and the other symptoms caused by prolonged
computer use. As our dependence on computers continues to grow, an
increasing number of people are seeking medical attention for eye
strain and irritation, along with back, neck, shoulder, and wrist
soreness.
These problems are more noticeable with computer tasks than other
near work because letters on the screen are formed by tiny dots
called pixels, rather than a solid image. This causes the eye to
work a spot harder to keep the images in focus.
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Causes:
The people normally blink less when working on computer and
blinking is necessary to keep eyes moist
and relaxed. Less blinking causes excess of evaporation and dry
eye.
Some people also have minor
problems such as eye coordination and focusing that aren't
apparent in other activities, but become an issue when using the
computer.
Computers are often set up in
ways that make eyes work too hard.
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The computer typeface may be
too small
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The glare from nearby lights
or windows may be too bright
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The monitor may be
placed higher than is natural for your eyes.
People over 40 with bifocals
or reading glasses often run into problems because their glasses
are geared to looking at books held 16 inches away, rather than
computer screens that are typically two feet away.
Pathophysiology:
CVS is caused by decreased
blinking reflex while working long hours focusing on computer
screens. The normal blink rate in human eyes is 16-20 per minute.
The blink rate to decrease to as low as 6-8 blinks/minute for
persons working on the computer screen. This leads to dry eyes.
Additionally, the near focusing effort required for such long
hours puts strain on ciliary muscles of the eye. This induces
symptoms of asthenopia and leads to a feeling of tiredness in the
eyes after long hours of work. Some patients present with
inability to properly focus on near objects after a short
duration. This can be seen in people aged around 30-40 yrs of age,
leading to a decrease in the accommodative focusing mechanisms of
the eye. This can be a setting for early presbyopia
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Symptoms:
1. Eyestrain
2. Blurred vision
3. Dizziness or nausea
4. Headaches
5. Red, dry or burning eyes
6. Increase in nearsightedness
7. Change in color perception
8. Slow refocusing
9. Excessive fatigue
10. Neck, shoulder and back pain
11. Eye-teaming problems and/or occasional double vision.
Preventive steps:
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If you have trouble with your
eyes when computing, follow the preventive measures which can give
you relief from most of the symptoms:
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Position your monitor 16
to 30 inches away from your eyes, depending on what's comfortable.
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It should be four to eight
inches lower than eye level, so you're look- slightly down towards
it. And it should be tilted slightly up, as if it were a book or
magazine. Looking down covers more eye and so tear evaporation
from exposed surface is less.
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Place light sources
perpendicular to your computer, so they won't shine in your eyes
or reflect on your screen. If you have a glare problem, consider
installing a glare screen or a three-sided hood on your computer.
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Use a large enough typeface.
Experiment with different fonts and background colors to see if
one is easier for you to read.
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Adjust your monitor for the
most contrast that you are comfortable with.
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Make efforts to blink
frequently.
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Take short breaks that are
look away from the screen or close the eye periodically for few
seconds / minutes.
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In persons above 40 who are
using bifocals will need special glasses for computer work.
Treatment:
1. Use of artificial tears or contact lens wetting solution to
keep your eyes moist gives relief from symptoms.
2. People with moderate to severe eyestrain or fatigue may need
glasses.
Dr. Makbul G.
Mansuri
M.S. (Ayu.) Shalakyatantra,
Lecturer Shalakyatantra,
J.S. Ayurved College,
NADIAD-387001 (Guj.)
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