How many times have you done it?  Come on admit it, how many times have sat on the dock, or beach , in the bright sunlight reading the Sunday newspaper with both your reading glasses and yor sunglasses on at the same time.  Then I discovered ONO'S.  A fashionable polarized Reading sunglasss, that is optical grade CR-39 lense which is scratch resistant and 100%UVA/UVB protection.  They have the Powerful magnifying lens that is positioned 8mm below straight ahead level.   So under normal distance use, you're not distracted.  But merely glance down to read and fuzzy details spring into sharp focus