An anti-reflection coating lets more light through the lens and cuts the reflections on its surface. That means less glare from oncoming headlights and screens, and people can see your eyes in photos and on video calls.
A hard coat makes lenses more resistant to scratches, although no lens is scratch-proof. Rinse your lenses under running water, wash them with a drop of mild soap if needed and dry them with a clean microfibre cloth. A shirt, tissue or paper towel can scratch them, and heat such as a car dashboard in summer can damage coatings.
Lenses that filter blue light are a comfort or preference choice. There is no good evidence that the light from phones, tablets or computers damages the eye.
Light-reactive (photochromic) lenses darken in sunlight and clear indoors. Car windscreens block most of the ultraviolet light that makes them change, so they darken less while you drive. Polarised sunglass lenses cut the glare reflected off roads, water and car bonnets, which many drivers, anglers and outdoor workers appreciate.
Tell us how you use your spectacles, for driving, screen work, sport or being outdoors, and we will help you choose what suits you.