Progressives lenses are invisible (no-line) multifocals. The prescription power changes gradually from distance prescription on upper portion to reading prescription on bottom portion. It essentially performs similar to a trifocal, but with a smooth transition from distance to near.
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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)