Will wearing glasses weaken my eyes?

No, if spectacles are prescribed and worn correctly they will not weaken your eyes.

There are many forms of spectacle prescriptions, the most common is used to eliminate blurry vision. If they are worn correctly, ie as recommended by your optometrist, then it will not weaken your eyes.

Spectacle are also sometimes prescribed for theraputic use. This is often used in cases of childhood developmental vision problems and prescribed in order to remediate and rehabilitate problems with focusing and convergence for example. Therapeutic lenses are used for the time the problem exists and ceased after the optometrist deems the visual system no longer requires support.