dc, for your absolute best vision you actually need to have an eye exam. most people do not have the same prescription in each eye. when an optician makes prescription eyeglasses, the lens optical center needs to be placed directly in front of your pupil. everyone's eyes are different distances apart when looking at distance/near and a lot goes into making glasses to account for this. that said, over the counter glasses have the optical centers of the lens pre-set and may not line up with your pupils. if you wear them a lot, it can cause eye strain, headaches, etc. a lot of people can accommodate for this and the otc's will work for them without major problems. bifocals do take some getting used to, but are worth not having to take readers on and off constantly. one problem you may have when wearing them initially is steps, curbs etc. just looking down through the lower portion of the lens is magnified, so be careful when walking and looking down until you get used to them. modern progressive lenses (no line bifocals) are better and let you see at all distances, near and far. all this said, give the bifocal safety glasses a try. there is no power in the lens for distance vision, only for the bifocal segment. they are cheap enough that if you don't like them, no big loss. i think you'll like them. i used the olympic models in clear and tinted for motorcycle riding until my distance vision changed. now i wear prescription progressive lenses.