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I sit at the computer for more than 20 hours per day. when I work on my computer for longer hours I get tears in my eyes also headache and dizziness. I was just wondering if it will affect my eye sight if I look at the monitor for a long time. If yes then what type of monitor is good .

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For any type of monitor, experts recommend taking "eye breaks" every 1-2 hours at a minimum. This would normally involve changing your visual range (look at something far away) or in a different lighting situation. Since you should also be taking mental breaks, and breaks for your hands if you type/click a lot, it's wise to combine. For me, at least every 2 hours I:

  • Get up from my desk.
  • Stretch/wriggle hands and fingers.
  • Take a walk down the hall and back.

This can be a bathroom break, trip to the lunch room, get some water, whatever. But you need to get up and away from the screen for 5 minutes or so.

Also, it's better for your eyes if you have decent lighting. A dark room with a bright screen is especially hard on the eyes, but you also don't want direct light causing a glare or making the screen hard to see.

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where should the light be behind the user or in front of him ? –  subanki Aug 31 '10 at 18:43
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Overhead is probably best. If the light is behind you may get a glare, if the light is ahead of you it may be behind the monitor and give you backlighting, which makes it harder to see. –  JNK Aug 31 '10 at 18:47
    
Small fonts also put unnecessary strain on your eyes. –  ggustafsson Mar 12 '12 at 14:32
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Yes! You got headache and dizziness which means you have CVS (Computer Vision Syndrome).

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.

The most common symptoms associated with Computer Vision Syndrome (CVS) are eyestrain, headaches,blurred vision,dry eyes,neck and shoulder pain.

Luckily, it can be treated. Keep the following tips in mind:

Monitor Location

Ideally more than 25 inches from eye and 6 inches below the horizontal eye level.

Anti-glare screen

Will decrease the amount of light reflected from the screen.

Light effect

Use suspended lights from ceiling and windows with shades, blinds or curtains. Avoid light hitting directly on eyes.

Sitting posture

Use chairs with armrests which are able to provide, support while typing, position of head slightly tilted downwards and height of the chair adjusted appropriately so that the feet reset flat on floor.

20-20-20 rule

Follow the 20-20-20 rule, which means every 20 minutes, look away from the monitor, and focus on an object at least 20 feet away, for 20 seconds.

Eye Exercise

Choose your eyes and slowly roll your eyeballs clockwise and anticlockwise. Repeat it 3 times.

Blinking

Blink frequently to keep the front surface of your eye moist.

Computer Eyewear

To block the blue light, glare, and radiation when in computer and mobile device use. It works better than a monitor or screen protector.

Besides the tips to get rid of CVS, I recommend T'amie computer eyewear (http://www.halovis.com) since I feel comfortable with wearing it. It claimes to block 97% of blue light and 100% of UV filter. You can have a try if needed.

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