Abstract: A three-layer antireflective coating composition for a CR-39 or glass substrate comprising a middle layer containing titanium compounds sandwiched between top and bottom layers containing polysiloxane, wherein the top and bottom layers are titanium-free; and a process for preparing said antireflective coating with improved adhesion on a CR-39 or glass substrate. The thicknesses of each of said coating layers is in accordance with preselected equations, and the refractive indices of said coating layers satisfy the following requirements:n.sub.m >n.sub.b,n.sub.m >n.sub.t,andn.sub.b .ltoreq.n.sub.swherein n.sub.m is the refractive index of the middle layer, n.sub.b is the refractive index of the bottom layer, n.sub.t is the refractive index of the top layer, and n.sub.s is the refractive index of the CR-39 or glass substrate.
Abstract: A color enhancing sun lens comprising a lens having an integrated visible light transmission, with respect to CIE illuminant C, of less than 40% T, wherein the transmission over a 10 nm wide band centered on 480 nm and a second 10 nm wide band centered on 630 nm is at least 1.5 times the integrated visible light transmission of the lens.
Abstract: A two-layer antireflective coating composition stacked on a substrate consisting of allyl diglycol carbonate polymer (CR-39) or glass and comprising a bottom layer containing less than 10% by weight of titanium dioxide equivalent weight and a titanium-free top layer containing polysiloxane resin; and a process for preparing said antireflective coating with improved adhesion on a substrate consisting of allyl diglycol carbonate polymer (CR-39) or glass. The thicknesses of each of said coating layers is in accordance with preselected equations, and the refractive indices of a said coating layers satisfy the following requirements:n.sub.s <n.sub.b >n.sub.twherein n.sub.s represents the refractive index of the substrate consisting of allyl diglycol carbonate polymer (CR-39) or glass, n.sub.b represents the refractive index of the bottom layer, and n.sub.t represents the refractive index of the top layer.
Abstract: An artificial eye lens such as a contact lens or intra-ocular lens corrects astigmatism by two sets of substantially linear parallel zones arranged to diffract light predominantly into one order at one orientation, the spacing of the zones diminishing on either side of the linear axis. In addition circular diffraction zones may be provided to give both spherical and cylindrical power for astigmatism correction.
Abstract: Polymerizable and cross-linkable, radiation curable coating compositions particularly designed for deposition as an abrasion resistant, tintable coating poly (bis phenyl A) carbonates. The formulation is a mixture including:(a) 25-94% by weight of a polyfunctional acrylate or methacrylate monomer having at least three acrylate functional groups per molecule or a mixture of such monomers;(b) 3-50% by weight of a monomer selected from N-vinyl derivatives of linear or cyclic secondary amides, tetrahydrofurfuryl acrylate or methacrylate, N,N-di(lower alkyl) acrylamide ethylenically unsaturated monosilane, or a mixture of such monomers; and(c) 3-40% by weight of an ethylenically unsaturated monomer having a Tg less than 80.degree. C. or 3-30% of an ethylenically unsaturated copolymer with a Tg less than 100.degree. C.
Abstract: A composition is disclosed useful for cleaning hard and soft contact lenses, in which cleansing action is provided by a relatively soft abradant particulate sparingly soluble room temperature solid organic acid or inorganic salt, preferably in combination with one or more surfactants. The particulate material effectively removes deposits from the lens, and readily dissolves on the application of water.
Abstract: Tinted hydrophilic plastic articles, such as soft contact lenses, are prepared by carrying out the tinting operation while the hydrophilic material is still in its non-hydrated state. Tinting at this point avoids the need for use of swelling agents and also permits integration of the tinting procedure into an overall automated manufacturing operation. A preferred embodiment of the invention is an integrated process for producing a tinted soft contact lens comprising the steps of providing a casting mold having an arbor formed as a cup shaped container, filling said container with a monomeric lens forming liquid, polymerizing said liquid to produce a lens blank having one optical surface formed by the bottom of said cup shaped container, generating (e.g.
Abstract: A multifocal lens has an upper distance vision zone which is divided by a visible division from a distinct lower portion of the lens which includes an intermediate vision zone of progressively increasing dioptric power which leads into a near vision zone. The visible division is provided by an abrupt change in dioptric power in the range from about 0.5 dioptres to about 0.5 dioptres less than the difference between the constant dioptric powers of the near vision zone and the distance vision zone.
November 19, 1986
Date of Patent:
February 21, 1989
Pilkington Visioncare Holdings, Inc.
Ronald W. Ewer, deceased, Dean G. Scott, legal representative, Kevin D. O'Connor