a polarised screen
A desk lamp may seem unnecessary if you use your computer all day long, but using a good lamp can do quite a bit to reduce eyestrain. Simply light the lamp behind your computer monitor.
Dark light, bright light and flashing light.
The brightness and contrast have some impact on eyestrain, but the main cause of eyestrain from computer monitors is the refresh rate. You should turn the refresh rate up as high as your monitor supports, especially if you are in an area with fluorescent lights. The default refresh rate for a monitor is 60 Hz, the same as fluorescent lights. With your monitor flickering at 60 Hz, and the lights flickering at 60 Hz (and not at the same time) the back-and-forth flickering, even though it can't be noticed, can cause considerable eye strain.
how can eyestrain be avoided in microscopic study
If you mean how to reduce the power of your eyeglasses, you will want to ask your optometrist if doing so would be a good idea for you. If you are experiencing eyestrain, headaches and such, it may be time to see your Dr.
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Blow a big load on your monitor and it will reduce the glare comming from it...
To reduce shadows on your monitor, ensure that there is adequate lighting in the room to evenly illuminate the screen. You can also adjust the monitor's brightness and contrast settings to optimize visibility and minimize shadows. Additionally, positioning the monitor at a proper angle and distance can help reduce shadowing effects.
Blow a big load on your monitor and it will reduce the glare comming from it...
Use lower levels of lighting to reduce glare on monitors.
Allow guests to monitor themselves