Progressive ophthalmic lens with positive distance power

US5210553A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Rudolf Barth · Hohenkirchen, DE
• Klaus Wehmeyer · Herford, DE

Key dates

• Filing date: Mar 18, 1991
• Grant date: May 11, 1993
• Expiry date: Mar 18, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/068
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Disclosed is a progressive ophthamic lens having positive distance portion power, in which at least one surface is designed as a progressive area, and a distance portion (FT) intended for distant vision having practically constant distance portion power and a near portion (NT) intended for hear vision having practically constant near portion power including a progression zone (PZ), in which the surface refractive power increases from the surface refractive power (D.sub.F) present at the distant reference point (B.sub.F) along a curved of plane main meridian (HM) to the surface refractive power (D.sub.N) present at a near reference point (B.sub.N).