Multifocal spectacle lens having a large near-vision part

Details Multifocal spectacle lens having a large near-vision part Multifocal spectacle lens having a large near-vision part

1985-02-11

1987-09-01

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351171, 351172, G02C 706

Patent

active

046905243

ABSTRACT:
The invention is directed to a multifocal spectacle lens having an especially large near-vision part. A supplementary component is fused into a base dimensioned for the near-vision range. The supplementary part is for at least one distance-vision range. In this connection, it is especially advantageous to select the refractive index of the base to be greater than the refractive index of the supplementary component. Compared to known multifocal lenses made in one piece, the multifocal lens of the invention avoids steps or substantial image jumps between the near-vision and distant-vision regions. For shortsighted wearers of spectacles, the lenses are thinner and therefore lighter.

REFERENCES:
patent: 1990126 (1935-02-01), Laabs
patent: 2163130 (1939-06-01), Pellow
Kozol, F.; "The History, Theory and Application of Multifocal Lenses--XIII"; Optical Journal & Rev. of Optometry; vol. 100, No. 7; Apr. 1, 1963; pp. 27-31.

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