No, you cannot change the bifocal prescription on glasses without changing the lens. The lens is what is prescribed by your eye doctor. The frame, however, can be changed.
radio modern x-ray tube bifocal eye glasses
I used my bifocals to watch the television
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Bi means two, focal means to focus, so Bifocal glasses help you with both short sight and long sight.
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Advantages-Many things are controlled by infrared. sensors are invisible to the naked eye and are very reliable. Disadvantages- Most infrared sensors must be lined up or they will not work
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They are bifocals good for the one who wants it both in one frame check Eye glassdirect they have great types and collection of it.