Perforated soft contact lens and a method for manufacturing ther

Details Perforated soft contact lens and a method for manufacturing ther Perforated soft contact lens and a method for manufacturing ther

1984-12-21

1987-05-19

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351162, 351177, G02C 704

Patent

active

046662677

ABSTRACT:
A perforated soft contact lens which has at least one perforation formed inside the optical zone of lens, i.e. in the distance 0 to 3.5 mm from the lens center. It is manufactured by placing the lens in a swollen state with its inner surface on an elastic base and pressing a punch perpendicularly to the outer surface. Further possible method of manufacturing consists in sticking the soft hydrophilic lens on a hard base, drying and then drilling the openings, advantageously to the first contact of a drill with the base.

REFERENCES:
patent: 4157864 (1979-06-01), Koller et al.
patent: 4211476 (1980-07-01), Brummel et al.
Neefe Optical Laboratory (Advertisement), Contacto, Nov. 1975.
Groppi, J. J., "New Aspects in the Fitting of Multi-Range.RTM. Bifocal Contact Lens", Contacto; vol. 15, No. 2; June, 1971.
Neill, J. C., "Electronic Venting of Corneal Contact Lenses", Contacto; vol. 11, No. 2; pp. 9-11, June 1967.

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