Take this test and you'll see. Sitting too close to the television will harm your eyes. Watching television in the dark can damage your eyes. You can harm your eyes if you wear drugstore eyeglasses for reading. The darker the better when it comes to sunglasses.
Many people suffer from eyestrain after using computers.
Eye exercises are a good way to strengthen your eyes. Safety goggles are necessary only for workers dealing with hazardous machinery. Vision deteriorates rapidly with age. That is really one of the big myths. It has never been harmful.