Ophthalmic lens prism blocking ring

Details Ophthalmic lens prism blocking ring Ophthalmic lens prism blocking ring

1991-05-06

1992-09-29

Swann, J. J.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51216A, 51237R, B24B 4106

Patent

active

051505479

ABSTRACT:
A set of ophthalmic lens prism blocking rings is disclosed wherein each prism blocking ring comprises a substantially circular annulus adapted to be detachably connected between an ophthalmic lens to be ground and a blocking body. The annulus has a flat lower annular surface and a first thickness at one end of a diameter and a second thickness at the other end of the diameter and defines an inclined plane therebetween. The angle of incline corresponds to the amount of prism to be introduced into the lens.

REFERENCES:
patent: 3049766 (1962-08-01), Buckminster
patent: 3195197 (1965-07-01), Prunier
patent: 3866667 (1975-02-01), Knight

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