Start with regular cleaning using a microfibre cloth or chamois to avoid scratches and remove fingerprints. For a deeper clean, use a lens-safe solution or a mix of lukewarm water and gentle soap. Avoid products containing alcohol or harsh solvents. Rinse thoroughly with clean water, then dry with a soft cloth.
When not in use, always store your glasses in a hard case to protect them from dust and impact. Avoid placing them on surfaces where they could fall or scratch, and resist wearing them on your head—this can distort the shape of the temples.
Finally, check the screws and hinges from time to time, and have your optician adjust them if needed. Because even the smallest details deserve the right attention.