I've had good success with the stick on bifocal things. I have them on several sets of sun glasses - riding and driving; and on a pair of safety glasses. I trimmed some of them to a smaller field of view and to fit fancy glasses shape. Tried the bifocal contact lenses in the past and didn't like them - not long enough or short enough. I've since got implants (cataract surgery) nearly corrected to 20/20 so I can use non-prescription sunglasses in the daytime. #