Bifocal contact lenses

Details Bifocal contact lenses Bifocal contact lenses

1992-07-31

1995-07-04

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

054305047

ABSTRACT:
A device for manufacturing bifocal contact lenses is provided. It comprises a rotating head stock provided with an eccentric head supporting a lense holder for holding a lense blank. The lense holder is displaceable with respect to said eccentric head in a radial direction perpendicular to the axis of rotation. A sled is provided for supporting a cutting tool. Said sled pivotable around an axis which coincides with said axis of rotation and in addition displaceable to change the radii.
For avoiding a step which would result at the junction line dividing the distant vision segment and the near vision segment, a control is provided for adjusting the tool to a first radius R1 for cutting the distant vision segment and for adjusting said tool to a second radius R2 for cutting said near vision segment. After cutting the distant vision segment during a first operation, the near vision segment is cut during a second operation such that a continuous transition is achieved between both segments.

REFERENCES:
patent: 3913274 (1975-10-01), Raiford et al.
Mandell, R. B; "A No-Jump Bifocal Contact Lens"; Optometric Weekly: vol. 58, No. 22; Jun. 1, 1967; pp. 19-21.

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