A bifocal lens is split into two parts. The top part is usually designed for distance and the bottom part for reading, however, the two areas of the lens can be changed for computer and reading use.
Lenses are available in various thicknesses, from a standard index of 1.5 through to ultra-thin index of 1.74 designed for higher prescriptions.
If you have a thin metal frame, to make your glasses look their best, we would suggest selecting a higher index lens.
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Per pair, inc. fitting & postage