i have a 17 inch CRT monitor, i spend up to 10 hours a day on it, and i dont get sore eyes, yes TFT or LCD are better on your eyes
i hope you find this useful
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How To Buy Monitors
By Charles Dejongh
If you are buying a new computer system that comes with a new monitor or if you are buying a new monitor you need not worry too much about the specifications. Most of the new monitors today are pretty good. If you are buying an older or used computer or replacing your monitor then you will have to be careful because some of the older monitors or computers do not support the latest graphics. Monitor prices are pretty reasonable today so I would stay away from buying a used one.
There are several factors you should consider when choosing monitors. For a desktop computer, If you will be using it a lot, choose a monitor that will be easy on your eyes. You can buy Antiglare filter screens that fit on your monitor to cut down on the glare. The Flat screen CRT's usually have better Specifications then a regular CRT and they cut down on glare and distortion. Don't get these confused with Flat Panel LCD screens.
Get a color monitor. Standard monitor size is normally 15 inches but you can buy a 17 inch or larger screen to make it easier on your eyes.
A dot pitch of .27 is better than .28. The smaller the number the better, and a sharper image you will have.
The higher the refresh rate or vertical frequency (Measured in Hz) the less flicker you will see in your monitor. Less flicker can be less tiring on your eyes especially if you will be using your computer for long periods. If you want a real good monitor try to get one with a rate of 75Hz or higher for a 17 inch screen and 85Hz or higher for larger screen sizes.
Get a non-interlaced type monitor. A Non interlaced type monitor refreshes every line on the screen while interlaced only refreshes every other line on the screen. A non interlaced monitor will also have less flicker.
Flat Panel (LCD) Monitors
The new Flat Panel LCD (liquid crystal display) monitors are great for an office to save space and use half the power of CRT monitors but you are going to have to pay a lot higher price as compared with the conventional CRT (cathode-ray tube) type for one with a reasonable display image. You can get an excellent and larger CRT monitor for the money you would spend on a an OK Flat Panel LCD. If you are into computer gaming I would not even consider getting one due to the graphics response rates.
The Advantages of Flat Panel LCD monitors are:
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No Flicker - less eye strain
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Less Distortion
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Uses less power
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Takes up less space
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Heat and Radiation emissions are less
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Glare - Less eye strain
The Disadvantages of Flat Panel LCD monitors are:
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costly
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lower price models may have problems such as missing pixels in spots or fuzzy images.
In Summary: The disadvantage of a flat panel LCD screen are images are not as sharp and detailed. You also have to look at the screen straight on because the display viewed from an angle is not that good. If you like to play games or work with a lot of graphics on your computer stick with a CRT monitor.. I would recommend a Flat screen CRT. So if you must get a flat panel LCD don't get a cheap one! Expect to pay for a fair LCD.
Things to look for:
!. Viewing angle in degrees. - how far you can get away from the center of the screen before pictures becomes hard to see.
2. Brightness - ( measured in cd/m 2 or nits ) the higher the number the better
3..Active-matrix displays which use TFT (Thin Film transistors ) are best but cost more than Passive-matrix displays
4. Refresh Rate - Because of the way LCD screens monitors are made they really do not produce flicker and there is no need to look at refresh rates.
5. Look for a good dead pixel warranty. according to the article "Consumers see red over dead pixels" on c/net some companies like Samsung have a "no dead pixels" policy on some LCD monitors.
Taken From:
http://thepcyoubuy.com/page4.html
hopefully that should help you in determining the best monitor to buy