After years of restraining pit bulls I have some neck mobility problems. For me mirrors are important because it lets me reduce the number of times I have to look over my shoulder. I use the Take a Look mirrors also, one on my sunglasses and one on some polycarbonate farm safety googles that are clear, but are also UV coated. Both my sunglasses and the googles have fairly thick temple pieces. I found that my wire frame bifocals were too light to use with the Take a Look. Both my sunglasses and the googles are also equipped with reading lenses that are attached with water (Optx20/20) so I can read a map while riding.