Method of farbricating an optically graded light occluding gel

Details Method of farbricating an optically graded light occluding gel Method of farbricating an optically graded light occluding gel

1986-03-17

1987-11-17

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204299R, 2041801, 8507, 8444, 351177, 351162, G02C 710, B01D 5702, B05D 506

Patent

active

047072369

ABSTRACT:
The invention pertains to an electrophoretic technique for fabricating a progressively graded concentration of dye in a hydrophilic polymeric matrix or gel. A charged dye or dye precursor is caused to migrate under the influence of an electrical potential through the gel matrix. An area is formed in the hydrogel matrix which is progressively graded in optical density as a function of the distance from the point of application to the hydrogel matrix. The insertion of the dye through the hydrogel matrix of a contact lens it may be used to form a contact lens with an optically graded central spot.

REFERENCES:
patent: 3034403 (1962-05-01), Neefe
patent: 4447474 (1984-05-01), Neefe
patent: 4576453 (1986-03-01), Borowsky

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