[0] WEEKENDER.

Ever wondered if there's any truth in some of the things that your parents or grandparents tell you about your eyes?

For instance, you may have been warned that if you cross your eyes on purpose they can stay that way. Or other people say that sitting close to the television can ruin the eyes.

You may even hear that using a night light will cause nearsightedness, but there's no clear scientific evidence to support this idea.

You can strain your eyes if you don't have enough light when you read, but it will not ruin your vision. Staring at a computer screen for too long will also strain your eyes.

So how does an eye work? Quite remarkably, …