FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Old-style CRT monitors are known to emit UV light, which can promote cataracts and macular degeneration. Modern LCD screens tend to emit light from the blue end of the spectrum known as HEV (high-energy visible) light.

Detailed explanation-2: -Eye strain can lead to a headache, though not as often as many people think. Other types of eye problems-such as dry eye, injury to the eye, degenerative eye disease, uncorrected nearsightedness and farsightedness, and eye infection-can also cause headaches.

Detailed explanation-3: -They may last a few hours to a few days. If you suffer from migraines – a type of headache that causes severe throbbing or pulsing pain on one or both sides of the head – screen time can aggravate any associated light sensitivity. Eye strain, brightness, blue light and screen flickering can be migraine triggers.

Detailed explanation-4: -Flicker occurs on CRTs when they are driven at a low refresh rate, allowing the brightness to drop for time intervals sufficiently long to be noticed by a human eye – see persistence of vision and flicker fusion threshold.