uv blocking contact lenses

I train, work and recreate in the bright sun at and around the beach a lot during our warmer months, which is to say about 10 months out of the year. I wear sunglasses much of the time but I end up taking them off because I either get tired of them or they're not suitable to an activity. A search for contact lenses that provide effective UVA and UVB protection only yields results for refracting lenses. Does anyone know of any non-refracting, transparent lenses whose sole job is to provide UV protection?