Single vision lenses have your prescription power throughout entire lens. They are the simplest and least expensive replacement type.
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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)