Bifocals lenses have distance prescription power on upper portion of lens and lined segment with reading prescription power on bottom portion of lens.
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About Hi-Index Lenses:
Hi-index Lenses are lighter and thinner than Polycarbonate or Plastic.
Especially good for strong prescriptions.
Filters UV in daylight and fluorescent lighting.
Comes automatically with scratch resistant coating.
Eyeglass People offers Hi-Index 1.60 (about 10% thinner than Polycarbonate) and Super Hi-Index 1.67 (about 20% thinner than Polycarbonate)