Wash and dry your hands
Hold the spectacles by the bridge with both hands
Check whether the frames sit level on your face
Gently bend the temple arms inward or outward to improve fit
Adjust the nose pads so the frames rest evenly on your nose
Tighten loose screws with a small eyeglass screwdriver
Warm plastic frames slightly before bending them
Avoid forcing metal frames or plastic frames
Check that the lenses are centered in front of your eyes
Test the fit by wearing the spectacles for a few minutes
Repeat small adjustments until the fit feels secure and comfortable
Visit an optician if the spectacles still feel crooked or loose