The optometrist is the one who examines your eyesight and your eyes. If he finds that you need glasses, he gives a prescription to your parents.
The optician is an eyesight specialist. Starting from the prescription written by the optometrist, he helps you to choose your lenses and your frames. Then he adjusts your glasses to the shape of your face.

Are you wondering about your eyesight disorder or how to take care of your glasses ?
Ask your optometrist or your optician for advice !