+1.0+1.5+2.0+2.25+2.5+2.75+3.0+3.50+4.0 TN37. The unique benefit of bifocals over standard reading glasses are that they have two points of focus, for both close range and distance. The top half is non-magnified and is useful for seeing into the distance, whilst the bottom section is magnified and is ideal for seeing at close range with greater clarity.
eBay