Many wearers wonder how to tell if the lens is right side out or inside out (yes, there is a right side). The difference between a right-side out and an inside out lens can be subtle. But the trick is to look at your lens and make sure the lens looks like a half circle rather than looking like it has a bevelled edge or a rim. If you do insert it inside out you can usually tell immediately because it will be uncomfortable and not sit snug on the eye. Also, if it looks the same both ways this could mean that the lens is beyond its usage and should be replaced.