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Wipe the lenses with the microfibre cloth and store them in the case when they are not worn. Keep them away from heat and from rough surfaces, and rinse with a little water before wiping if they are dusty.

The frames here come with our non-prescription filtered lenses. To combine a prescription with a blue-light filter, take a frame to your optician and ask for a filtered lens — our frames are standard sizes that fit common prescriptions.

The frames are lightweight acetate or thin metal, adjusted by hand so they sit evenly and lightly on the face. If the fit feels off, the nose pads and arms can be gently adjusted at home or by any optician.

Not necessarily — the clear low-tint lens is a good all-day choice. The amber tints filter more of the blue end, which many people prefer for the evening and before bed. It is a matter of comfort and taste.

The main pairs are non-prescription (no lens power), for people who do not wear glasses otherwise. If you already wear prescription glasses, the clip-on lens fits over them, or you can get your prescription lenses in a filtered version from an optician.

They filter part of the blue light from screens, so a display looks a little warmer and gentler on the eyes during long evening sessions. They are a comfort for screen time, not a medical device and not intended to address any eye condition.