My dad always forbids me to use computer for long time because it effects our eyesight. But I heard that using computer or watching tv for a long time doesn't effect our eyes. Now which is tue?
Your dad is right. LED screen can always make damage to our eyes, especially watching it in a totally dark environment. Watching TV in a dark place for a long time may cause macula in your eye ground. So it is better to take a break every 30 minutes when you have to using TV or computer for works.