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Prism section lens spectacles

  • US 4,961,639 A
  • Filed: 06/30/1989
  • Issued: 10/09/1990
  • Est. Priority Date: 06/30/1989
  • Status: Expired due to Term
First Claim
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1. An optical lens having a slab-off prism including a slab-off line passing transversely through said lens to define upper and lower viewing sections oppositely adjoining said slab-off line, and a second prism, said slab-off prism and said second prism forming a dual prism combination lens and being incorporated only in the upper viewing section.

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