Quote:
Originally Posted by reamo
What's the physiological reason why bright screen can tire eyes easily? It makes your pupils smaller because of the bright light but this is not enough to cause eyestrain. Anyone can share an article or two about this aspect? I'm using a 32" LCD monitor in the PC for browsing and wondering if things are better for the eye if I use the 9.6" iPad instead of the 32".
|
Personally, I know when I get tired looking ad monitorscreens.
In the past, it's the CRT-refreshes which causes tiredness. Even at 120hz the screen still flickers when reading. Not to mention they're less sharp than LCD.
Then comes LCD with sidelighting. Cathode lighting used commonly in laptops and tft-screens until a few years ago. The lighting is uneven, if you don't look straight into the screen, letters gets distored. Your brain/eyes automatically adjust like some biological stabilized lens. But this gets tiring.
Now, backlighting with leds are common. This solves the light distortion, but the viewing angle is still not perfect, as colours gets washed. And cheaper monitors won't be lighted evenly.
If you buy a new monitor, the default setting is usual >75% contrast and brightness. I've worked in IT and met thousands of "common people working on a computer". Never have I met anyone there who knew to adjust the contrast and brightness to the surroundings.
Even my wife was complaining about eyestrain on her computer, until I set the correct lighting for her...
With this kind of experience, it's easy to make the (false) conclusion that "lighted screen=eyestrain". Even though it's often a matter of screen refresh, brightness settings, viewing angle and general posture... Eliminate those factors and you should have no problem at all.