LENS FOR SPECTACLES AND SPECTACLES USING SAID LENS

Japanese Patent JPH01243016

A

PURPOSE:To obtain bifocal spectacles for far and near visions which allow viewing of near and far objects through the entire area of lenses by alternately and concentrically forming reference degree ring bands of a very small width constituting a reference lens face and Fresnel-like ring bands of a very small width constituting an additional degree lens face. CONSTITUTION:This lens has the constitution consisting in spacing each other ring band-like small lenses of the Fresnel lens of the diopter added with the additional diopter to the reference diopter and disposing the reference degree ring bands 3 between these ring band-like small lenses. The respective reference degree ring bands 3 and the Fresnel-like ring bands 4 constitute respectively the lenses having the separate diopters as a whole. The light past the ring bands 3 and the light past the ring bands 3 respectively form images at separate points. The distant view image past the ring bands 3 and the near view image past the Fresnel ring bands are simultaneously formed on the retina in the focused state when the objects are viewed through this lens by the presbyopia. The bifocal spectacles for far and near visions which can view the far and near objects through the entire area of the lens are thereby obtd.

OKAMOTO TAKAHIRO

JP7097988A

September 27, 1989

March 24, 1988

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OKAMOTO TAKAHIRO

G02C7/06; G02B3/08; G02B3/10; (IPC1-7): G02B3/08; G02B3/10; G02C7/06

Toyoji Higuchi (1 person outside)

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