What did it mean "Television is chewing gum for the eyes"?

The quote “TV is chewing gum for the eyes.” is stated by Frank Lloyd Wright. It seems that this is the best quote that will describe what the TV can do for the mind. When people chew gum all the time, they may start to feel full even though they have not eaten anything. This is also the same as what television is supposed to do for the eyes.

It can make the eyes entertained but there are moments when they do not learn anything from it. Everything is already given to them so they do not make any effort to think or to even try to analyze things anymore. Over the past years, more educational shows are being shown on television.