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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 true?

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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.

Hal
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    Hi and welcome to the site. "Watching TV in a dark place for a long time may cause macula in your eye ground." makes no sense to me. The macula is a normal part of the retina, and "ground" isn't a verb I recognize in this context. Please note that this site (unlike many on SE) requires sources which support answers . Please see the site tour and the help sections for more information about Health.SE. – anongoodnurse Oct 21 '15 at 01:58