With consumers buying more frames online, it's become a necessity to know how to adjust spectacles yourself to avoid uncomfortable and unbalanced wear. Avoid doing adjustments too frequently yourself, as the more you manipulate the frames and hinges, the more likely they are to break.
Lay your eyeglasses right side up on a flat table. Check to see if either of the arms has become twisted. If so, rotate the twisted arm back into place gently with the pliers. If the frames are plastic, you will need to heat them first with a hairdryer. The outer edges of the frames should protrude a bit beyond the sides of your face, so that the hinged area of the temples are not touching your face.
Sit the glasses back on your face and feel if one or both temple arms are loose or digging in behind your ears. If so, remove the glasses and heat the front of the frame with the hairdryer and bend it to curve inward or outward until you get a snug, yet comfortable fit behind the ears. The curve should extend over the ear, without pushing into it.
Turn the nose pads so that your frames sit where you'd like them to on your face. If they continually slide down, you will need to turn the nose pads inward. If they are indenting the bridge of your nose because they are too tight, you can turn the pads slightly outward.
Tighten all of the screws to ensure you didn't loosen any during adjustments.