Things You'll Need
Omega earring backs
Smooth nosed pliers
Omega style earring backs are used to secure both clip-on and pierced-ear post earrings. A hinge allows you to fold the clip down, which is shaped like the Greek letter "omega." When the hinge reaches a certain point and the back is stopped by the back of your ear lobe, the earrings will be held securely in place. If you have a pair of earrings that use the omega earring back and they are too tight for your ear lobe, you can easily loosen them so that they are more comfortable.
Fold the clip back away from the earring itself and grip the base of the omega back with your pliers. Do not clamp down on the hinge, but a few millimeters above it.
Make a very slight bend in the metal with the pliers. Use a pair of jeweler's smooth nosed pliers so you don't end up warping the metal. Go slowly in very small increments, especially if your earrings are clip-on only. They will still need to be tight enough to hold the earring to your ear.
Try the earring on to see if the back was loosened enough so that it is now comfortable to wear. If it is still too tight, repeat Steps 1 and 2 until it is just right, and repeat with the other earring.
If your earrings are vintage, take them to a jeweler to be loosened professionally instead of taking the risk of breaking them.