I wear prescription eye glasses and am notorious for breaking the frames and scratching the lenses. I'm looking for something that is durable and, if possible, relatively inexpensive. I prefer thicker plastic frames over thin metal frames, but will consider anything as long as it is "unbreakable". Another feature that would be nice is some sort of clip on sunglasses so that I don't have to carry two pairs of glasses. A clip-on that is made for the frame would be ideal (something like the Zenni Optical magnetic clip-ons - I don't know their quality and durability, but they look cool to me). I would like to hear from anyone who has had good luck with any brands that fit this bill.