It is recommended that you visit an optician for a sight test every two years, or sooner if you've been asked to do so. This is important because an eye examination can detect potentially blinding eye conditions. It is easy to neglect the eyes because they rarely hurt when there is a problem. In many cases it is not possible to restore the vision that has been lost, but it is sometimes possible to stop or slow down the loss of vision. Find an optician near you.