The best replacement for high index is polycarbonate.

The best alternatives to high index are rated as following:
★★★★★  polycarbonate
★★★  polycarbonate lenses
★★  trivex
★  high definition lenses
★  mid index lenses
★  polycarb
★  mid index
★  polycarb lenses
★  1.74 high index
★  low index lenses
★  aspheric lenses
  mineral glass
  poly
  aspheric
  cr 39
  polycarbonate lens

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