Know exactly where the frame needs to be fixed
Observe your frame carefully, in order to figure out exactly where it needs to be fixed. To check the damaged points, lay your glasses flat on a straight surface upside down, with the lens frame touching the surface while the temples point up. Check where the frame is unusually pointing upward and locate the starting point.
Remove the lens
Using a small precision screwdriver, remove the screws holding the eye wire or rim and the side legs together. Then, remove both the lenses of the glasses. If your frame does not have screws, use the expansion method to remove the lenses. Heat the eye wire (the front frame), holding the lenses for five minutes with your blower set on high speed. The heat will expand the plastic or metal frame, allowing you to remove the lenses easily. Wrap the lenses in a soft cloth and put them aside in a safe place.
Repair the frame using soft pliers
Use a pair of soft pliers to fix the bent metal frames. Wrap a cotton ball or cloth around the bent area, as this will keep the pliers from scratching or damaging the surface. Put the pliers in the centre and apply a little pressure to bend the frame back into place. If the frame is still bent, try applying the pressure in the opposite direction as well.
Reshaping plastic frames
Fixing plastic frames with pliers can break them, so it is better to heat the frame before reshaping the bend back into place. Soak the frame in hot water for a couple of minutes, or apply hot steam to the affected area to make it pliable, and then bend it back into the correct shape. However, avoid overheating, as it may melt or further deform the frame. Once done, pat the frame dry with a soft linen cloth.