what happens to our eyes that makes us needs glasses?!

Best Answer - Chosen by Voters

As we age,the muscles that control the focusing of the lens cannot control the lens as effectively as they could when we were young. Hence, most older people need glasses. Also, when the lens focus is held in a specific place for too long, such as when reading a book, or working on a computer, the muscles lose their ability to focus the eyes at different lengths. That is why people whose eyes are focused at short distances for a long time tend to suffer from myopia, and those whose eyes are focused at long distances for a long time, like pilots, suffer from the opposite.