B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
88/40
B24B 13/04 (2006.01) B23Q 35/10 (2006.01) B24B 17/02 (2006.01) B29D 11/00 (2006.01) G02C 7/04 (2006.01)
Patent
CA 1319549
ABSTRACT OF THE DISCLOSURE A contact lens of soft, pliable ophthalmic plastic material and a method of making same. The lens, when in its dehydrated state, has a spherical back surface which in its hydrated state conforms to the corneal curvature of the wearer's eye and, when in its dehydrated state, having an aspheric front surface of polar coordinate form, having an asphericity which is a function (n)f [sin(a)] where (a) is the polar angle and (n) is the offset factor of a controlling circular surface. The method of construction consists of rotat- ing a lens blank about a fixed axis of rotation while swinging a cutting tool along a path centered on the axis of rotation between a centered position in which the cutting tool engages a vertex point of the lens blank and a position angularly swung with respect to the centered position in which the cutting tool engages the peripheral limit of the contact lens being made. The cutting tool and lens blank are progressively re- treated relative to each other as the cutting tool is swung from the centered position toward the peripheral position.
574882
Evans Cyril Carl H.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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