Multifocal lens

Details Multifocal lens Multifocal lens

1986-11-19

1989-02-21

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351172, G02C 706

Patent

active

048060100

ABSTRACT:
A multifocal lens has an upper distance vision zone which is divided by a visible division from a distinct lower portion of the lens which includes an intermediate vision zone of progressively increasing dioptric power which leads into a near vision zone. The visible division is provided by an abrupt change in dioptric power in the range from about 0.5 dioptres to about 0.5 dioptres less than the difference between the constant dioptric powers of the near vision zone and the distance vision zone.

REFERENCES:
patent: 2869422 (1959-01-01), Cretin-Maitenaz
patent: 3563057 (1971-02-01), Rosenbauer
patent: 4055379 (1977-10-01), Winthrop
patent: 4056311 (1977-11-01), Winthrop
patent: 4062629 (1977-12-01), Winthrop
patent: 4315673 (1982-02-01), Guilino et al.
patent: 4461550 (1984-07-01), Legendre
patent: 4472036 (1984-09-01), Kitani
patent: 4537479 (1985-08-01), Shinohara et al.

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