Back to the future!

That's a myth perpetrated from when TV's were more dangrrous and emitted trace amounts of radioactivity.

Also, kids with bad eyesight would naturally sit closer so that they could see better, so when those kids eventually got told they needed glasses, parents went "it was the TV!"

They do highly recommend that younger kids limit their use of 3D headsets to 30 min. or less per hour as it could negatively impact the brain development of hand eye coordination and body spatial awareness.