Menicon Co., Ltd.

Shin-etsu Chemical Co., Ltd.

Tomei Sangyo Kabushiki Kaisha

Ichiro Ando

Toshio Yamazaki

Atsushi Kobayashi

Toru Kawaguchi

Shoji Ichinohe

Hiroaki Suzuki

Hiroshi Yoshioka

Yasushi Yamamoto

Nobuyuki Toyoshima

Noriko Iwata

Yasuhiro Yokoyama

Eri Ito

Yuji Goto

Ryo Matsushita

Haruko Nagino

Yoshito Ikada

Yasuo Tarumi

Kazuharu Niwa

Akinari Itagaki

Tsuyoshi Watanabe

Takanori Shibata

Atsushi Hirashima

Junichi Ohashi

Aoi Nishizawa

Naoki Kondo

Provided is an ophthalmic diffractive multi-focal lens with a diffractive structure including a phase profile in which a plurality of blaze shaped zones are set in a concentric circle form, wherein: at least one of the zones serves as an adjustment zone wherein an inclination direction in the phase profile is reversed with respect to that of other zones; and a light intensity level giving a peak or focal point at a position away from three focal points in a light intensity distribution of transmitted light in an optical axis direction is kept low in comparison with a phase profile without the adjustment zone.

Ophthalmic diffractive multi-focal lens and method for manufacturing ophthalmic diffractive multi-focal lens

A diffractive multi-focal lens having a diffractive structure comprising a plurality of concentric circular zones, wherein: at least a portion of the diffractive structure is provided with an overlapping region in which at least two zone profiles overlap in the same region; in the overlapping region, at least a portion of a first zone profile has a zone pitch represented by a prescribed equation, and at least a portion of a second zone profile has a zone pitch represented by another prescribed equation; and an addition power Pgiven by the first zone profile and an addition power Pgiven by the second zone profile are determined by a prescribed relational expression, in which a and b are mutually different real numbers, and a value of a/b cannot be expressed by a natural number X or by 1/X.

Diffractive multi-focal lens and method for manufacturing diffractive multi-focal lens

The present invention pertains to a diffractive multi-focal ophthalmic lens, and the purpose is to provide a novel structure and manufacturing method in which improvement in optical characteristics such as halo reduction is obtained. A diffractive multi-focal ophthalmic lens in which a plurality of focal points are set by a diffraction grating comprising a blaze shaped phase function in which a plurality of zone sequences are overlapped, wherein adopted is a structure expressed by a phase function in which an inclination of a blaze of a specific adjustment zone in a standard profile is reversed.

Diffractive multi-focal ophthalmic lens and method for manufacturing diffractive multi-focal ophthalmic lens

A method for manufacturing a diffractive multi-focal ophthalmic lens capable of generating at least three focal points in an optical axis direction using a diffractive structure comprising a plurality of zones in a concentric circle form. A composite profile is generated by overlapping at least two starting profiles comprising a plurality of zones in a concentric circle form, and an adjusted profile is generated in which at least one of phase and amplitude is adjusted by employing a zone of the composite profile as a subject in order to set an intensity distribution in the optical axis direction and determine optical characteristics, to manufacture the diffractive multi-focal ophthalmic lens for which the adjusted profile is provided in at least a portion of the diffractive structure.

Method for manufacturing diffractive multi-focal ophthalmic lens and diffractive multi-focal ophthalmic lens

In order to reduce halos that occur in multifocal ophthalmic lenses, the mechanism of the phenomenon was elucidated and a solution was found based on the results. Thus provided are a multifocal ophthalmic lens having a structure and a manufacturing method for the same which can effectively reduce halos. A multifocal ophthalmic lens having a focal point formation region provided to an optical portion of a lens, which forms at least two focal points, wherein a cancellation region is provided to the optical portion, the cancellation region providing diffracted light of an amplitude distribution that reduces, on the image plane of the first focal point among the focal points, the amplitudes of light other than the light that forms the first focal point.

Multifocal ophthalmic lens having a focal point formation region and a cancellation region and manufacturing method thereof

Provided is a diffraction-type multifocal ophthalmic lens for which halos are reduced. Also provided is a diffraction-type multifocal ophthalmic lens having three or more focal points, which is implemented on the basis of the discovery that the diffraction-type multifocal ophthalmic lens has a characteristic whereby multiple focal points can be generated in the intermediate region as well as the near and far regions. Also provided is a method for manufacturing a diffraction-type multifocal ophthalmic lens which provides a simple design and manufacturing method by means of a simple diffraction structure and by replacing a cumbersome computer simulation with a simple method. This diffraction-type multifocal ophthalmic lens has a diffraction structure () where a plurality of diffraction zones are formed concentrically on the lens (), and an equal-pitch region is provided where pitches of at least two zones among the diffraction zones are made equal.

Diffraction-type multifocal ophthalmic lens and manufacturing method thereof

The present invention provides a dye composition for an ophthalmic lens, which is a dye composition used for dyeing an ophthalmic lens with an ink-jet coating equipment, characterized by the composition including: (A) a dye having at least one group having a carbon-carbon double bond selected from an &#x3b1;,&#x3b2;-unsaturated carbonyl group, a styryl group, a vinylbenzyl group and an allyl group per molecule; (B) a radical polymerization initiator; and (C) a solvent capable of dissolving at least a part of the component (A) and the component (B), and/or (D) a monomer having at least one radical polymerizable group per molecule.

Dye composition for ophthalmic lens, method for producing colored ophthalmic lens using the same, and colored ophthalmic lens

Provided is a colored contact lens in which a colored band is disposed at a boundary part between a dark part and a white part of an eye, and a density is gradually changed from the dark part to the white part of the eye such that the density of this colored band decreases from an inner circumference side to an outer circumference side. As a result, a novel colored contact lens is provided with which it is possible to bring out beauty of the white part of the eye, which has been ignored by conventional technology, while an impression is maintained that is as natural and elegant as possible by avoiding an artificial impression such as that found in conventional technology.

Colored contact lens

A novel manufacturing method for a diffraction lens, whereby aperture and eccentricity effects can be suppressed and any multi-focusing effect can also be obtained in a more stable manner. A synchronous structure is set up where at least two reliefs whose first order diffracted lights give respective focal distances different from one another are set to overlap with each other in at least a part of an area in a radial direction of a diffraction lens, and with respect to every grating pitches of one relief having the maximum grating pitch among the reliefs set up in overlap, grating pitches of another relief are overlapped periodically; and the resulting relief pattern is formed on a surface of an optical material.

Method of manufacturing a diffraction lens other than an aphakic intraocular lens

A method of manufacturing an aphakic intraocular lens that is capable of ensuring every multi-focusing effect more securely, while reducing the impact of aperture changes and lens eccentricity. At least two reliefs whose first order diffracted lights give respective focal distances different from one another are set to overlap with each other in at least a part of an area in a radial direction of the lens, and with respect to every grating pitches of one relief having a maximum grating pitch among the reliefs set up in overlap, grating pitches of another relief are overlapped periodically in order to obtain a relief pattern, so that the resulting relief pattern is formed on a lens surface.

Method for manufacturing aphakic intraocular lens

An artificial cornea comprising an optical element made of an optically transparent material, having a front surface and a posterior surface, and a skirt provided so as to support with surrounding at least a part of the optical element, characterized in that the skirt is provided with a flange on its side facing the interior of eyes during implantation of the artificial cornea and the flange radially protrudes outward from the skirt. The artificial cornea can be well compatible with ocular tissue, prevent leakage of intraocular aqueous humor and intraocular invasion of bacteria, reduce stimulation on palpebral conjunctiva and further, inhibit progression of the down growth, and which has no possibility of reduction in transparency of the optical element due to the down growth as well as detachment and extrusion from the implanted state.

Artificial cornea

A process for producing a shaped product, which comprises polymerizing a mixture comprising a radical scavenger, a polymerization initiator and a radical polymerizable monomer to obtain a partially polymerized mixture having the conversion of the monomer into the polymer of from 5 to 90 wt %, filling the partially polymerized mixture in a predetermined cavity and then applying polymerization energy to complete polymerization.

Process for producing a shaped product with a radical scavenger, polymerization initiator and a radical polymerizable monomer

A process for producing a shaped product, which includes polymerizing a mixture comprising an iniferter and a radical polymerizable monomer to obtain a half polymer having a rate of polymerization of from 5 to 90 wt %, filling the half polymer in a predetermined cavity and then applying a polymerization energy again to the half polymer to complete polymerization.

Process for producing a shaped product

A water-absorptive soft contact lens material having a high transparency, an excellent flexibility, a high oxygen permeability independent of water content, a high mechanical strength and an adequate hardness, which comprises a copolymer prepared by the polymerization of a monomer mixture comprising an N,N-dialkyl acrylamide or methacrylamide, an N-vinyllactam and a bis(silicon-containing alkyl) fumarate in a specific ratio, and which provides water-absorptive soft contact lenses having excellent properties such as high transparency and high oxygen permeability.

Water-absorptive soft contact lens material and contact lens made thereof

A water-absorptive soft contact lens comprising a polymer prepared by polymerizing a monomer mixture comprising, as main components, (A) 25 to 75% by weight of a (meth)acrylamide monomer, (B) 20 to 70% by weight of a fluoroalkyl (silicon-containing alkyl) fumarate, and (C) 0.01 to 10% by weight of a crosslinkable monomer. The water-absorptive soft contact lens has excellent oxygen permeability and high mechanical strength independent of water content, and is excellent in transparency and shape stability.

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Kasugai, Japan

Ichiro Ando