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>> Popularization of Science:
Prevention of “Computer Vision Syndrome”
Those using computer for a long period may feel uncomfortable,
which is called “computer vision syndrome” by ophthalmologist
and optometrist. The “computer vision syndrome” includes the
followings:
1. Eye overfatigue can be aggravated if not twinkling for a
long period when staring at the uorescent screen.
Computer user may avoid or reduce twinkling to avoid missing
the contents when reading a lot of documents. Twinkling,
which is of great importance to eye protection, can help
exchange location of lens and iris, which are under tension
status, in order to moisten the eyes, avoid itching, burning
sensation or other symptoms of eyes.
2. An abnormal reaction called “McCollough Eect” can be
generated when working in front of uorescent screen, since
green fonts are displayed on the black screen.
Regardless of the harmlessness to human body, the symptom
can last for days. Under the inuence of this visual eect, user
can nd certain pink colors in white letters and nd pink edges
around the white papers on walls.
3. It is related to operators wearing bifocals.
The optimal position of targets for operators should be chest
or below and recommended observing distance is 12~18
inches. The computer user may bend uncomfortably or keep
head at an unnatural angleif screen height is improper or
distance is too short, which easily leads to dizziness, neck
ache, and shoulder pain or body discomfort.
According to hygienist, computer operator requires concentra-
tion of vision, which may lead to the reduction of secretion of
lubricant and enzyme in eyes. Generally speaking, those that
twinkle for less than 5 times per minute and keep staring for a
long period may suer from eye drying, fatigue, ghosting,
blurred vision and ache of head and neck.
>> Popularization of Science:
Prevention of “Computer Vision Syndrome”
Computer has become an indispensable part of people in modern
times along with its popularization. People that have to stare at
computer screen all day long in work will easily lead to vision
fatigue and even trigger other eye diseases, such as glaucoma.
Therefore, computer operators should:
1. Avoid long-term and continuous operation of computer and
take a break for some time.
Take a break for 5~10min after continuous operation for 1h by
staring at long-distanced objects or doing eye exercises.
2. Keep good gesture in work
Keep a proper gesture and look at the screen horizontally or
slightly downwards; as the ideal position, the center of screen
should be set at the position about 20° below the horizontal
line, in order to relax the neck muscles and minimize the
exposure area of eyeball to the air.
3. Keep proper working position
Keep distance between eyes and computer screen for over 60cm.
4. Create and maintain good working conditions
Keep soft light ray of surrounding environment, proper
brightness of computer
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