How to adjust my TR 90 plastic eyeglasses frames?

[glasses cheap]

Firstly, warm up plastic eyeglasses before trying to bend them. Either run the temple tips under warm water or use a hairdryer on a low setting. Adjust to fit then cool the tips under cold water to set the fitting and restore the plastic to its firm state.

Find the optical center by holding your glasses right in front of your eyes without bending or leaning but stand perfectly straight. Locate the place on your nose where you want the eye glasses to rest in place. The frames will be adjusted according to this position.