How do computers and computer monitors harm you?

Is it true that being near computers too long can harm your body? How?

How do computers and computer monitors harm you?husqvarna

They can cause eye strain and headaches.

Sitting at a computer improperly can hurt your back.

Excessive typing and mousing can cause carpal tunnel syndrome.

How do computers and computer monitors harm you?microsoft office

I have heard that exessive computer usage, and it takes alot, can cause blindness.
It can cause insomnia. Not because you sit up so late, but because staring at a bright screen for a long time signals the sleep part of your brain that it is time to be awake.

Oh yeah, and carpel tunnel from the wrist action.