How to use: Just put on the sunglasses like you would with any regular pair. Make sure the nose pads and earpieces fit comfortably on your face. When you need to change the lens, gently hold the frame and remove the old lens, then insert the new one.
Things to note: Avoid scratching the lenses. Don't expose the sunglasses to extreme heat or cold for a long time as it may damage the frame or the lenses.
Maintenance advice: Clean the lenses with a soft, microfiber cloth regularly. If they get dirty, you can use a little mild soap and water, then dry them thoroughly. Store the sunglasses in the provided case when not in use to protect them from scratches and damage.