Abstract: A holding device for cutting a toric lens includes a chuck member which holds the lens workpiece, with a rotation and guide assembly provided such that an axis of the chuck member moves along a line perpendicular to the axis of rotation. The chuck member is held by a chuck support member, and the chuck support member includes guide ends which move along an inner periphery of a guide hole of a guide member. The guide hole has a center axis which is eccentric with respect to a rotation axis in a direction orthogonal to the rotation axis, such that as the guide ends of the chuck support member move along the inner periphery of the guide hole, the chuck member rotates while the chuck axis moves along a line which is orthogonal to the rotation axis.

Abstract: 1. A water-absorptive contact lens obtained by saponification of a copolymer composed essentially of:(A) from 1 to 30% by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolymerizing (a) an alkyl (meth)acrylate and (b) a monomer having at least two polymerizable groups per molecule, as the main components;(B) from 1 to 10% by weight of a vinyl monomer selected from the group consisting of maleic acid esters and N-vinyl lactams;(C) from 50 to 98% by weight of a fatty acid vinyl ester; and(D) from 0.02 to 10% by weight of a cross linking monomer.

Abstract: A presbyopia correction contact lens to be used in contact with a cornea of an eye of a wearer, the contact lens having a substantially circular central correction region and an annular outer correction region which surrounds the central correction region, the central and outer correction regions providing one and the other of a near vision correction region and a distance vision correction region, respectively, wherein the central correction region has a center which is offset by a distance of 0.2 mm-2.4 mm from a geometric center of the contact lens toward a side portion of the lens, which side portion is to be located on the side of the nose of the wearer when the contact lens is used in contact with the cornea, and the central correction region has a diameter within a range of 0.8 mm-3.5 mm.

Abstract: An ocular lens material made of a copolymer consisting essentially of (A) a polysiloxane macromonomer having polymerizable groups bonded by one or more urethane bonds to the siloxane main chain and (B) an alkyl (meth)acrylamide, wherein the weight ratio of the polysiloxane macromonomer to the alkyl (meth)acrylamide ranges from 10:90 to 90:10.

Abstract: A soft ocular lens material obtained by copolymerizing polymerizable components comprising (A) a fluorine-containing (meth)acrylate having a hydroxyl group of the formula (I): ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, R.sup.2 is a C.sub.5-15 perfluoroalkyl group, and n is 0 or 1, (B) a hydrophilic monomer, and (C) at least one monomer selected from the group consisting of silicon-containing (meth)acrylates and siloxane-containing styrene derivatives, wherein the ratio of the amount of the fluorine-containing (meth)acrylate (A) to the amount of the hydrophilic monomer (B) is from 20/80 to 70/30 by weight ratio, and the ratio of the total amount of the fluorine-containing (meth)acrylate (A) and the hydrophilic monomer (B) to the amount of the monomer (C) is from 30/70 to 90/10 by weight ratio.

Abstract: A method of producing an intraocular lens having integrally formed optic and haptic including the steps of: (a) preparing a polyimide powder having a repeated unit represented by the following formula: ##STR1## [in the formula, when R.sub.1 =--C(CF.sub.3).sub.2 --, R.sub.2 is selected from ##STR2## the polyimide powder having a particle size of less than 1 mm; (b) placing the polyimide powder between a pair of dies having a pattern corresponding to a part of the contour of the lens; (c) hot pressing the polyimide powder between the dies, to provide a molding having the above part of the contour of the lens; and (d) machining the molding to form the rest of the contour of the lens to thereby provide the overall shape of the intraocular lens.

Abstract: An ocular lens material comprising a copolymer prepared by polymerizing a monomer mixture comprising, as main components, (A) 15 to 40% by mole of a fluoroalkyl (silicon-containing alkyl) fumarate, (B) 10 to 50% by mole of a styrenic monomer, (C) 5 to 35% by mole of a hydrophilic monomer, and (D) 0.1 to 20% by mole of a crosslinkable monomer. The ocular lens material is excellent in all of transparency, oxygen permeability, mechanical strength and hardness. Further, the material is excellent in hydrophilic property in spite of its low water absorption.

Abstract: An ocular lens material made of a copolymer comprising, as main copolymerizable components, (A) a polysiloxane macromonomer having polymerizable groups bonded via one or more urethane bonds to the siloxane main chain and (B) an alkyl (meth)acrylamide, wherein the weight ratio of the polysiloxane macromonomer to the alkyl (meth)acrylamide is from 5/95 to 90/10.

Abstract: A host cornea marking device for providing marks on a recipient cornea bed of a corneal transplant patient is disclosed. The present marking device includes: an outer tube having a plurality of marking blades at one of opposite axial ends thereof which is adapted to face the recipient cornea bed, the marking blades being spaced apart from each other in a circumferential direction of said outer tube; and an inner tube which is received in the outer tube, such that the inner tube is axially slidable relative to the outer tube. The inner tube includes a contact portion at one of opposite axial ends thereof which is adapted to be in contact with the cornea bed so as to position the marking device with respect to a cutout section in the recipient cornea bed for receiving a donor cornea. A spring between the inner and outer tubes may be used to hold the inner tube in a first position.

Abstract: A marking apparatus for providing desired marks such as characters, symbols, graphics, etc. on surfaces of contact lenses in a standardized manner. The marking apparatus includes a main shaft rotatable about an axis and a screen support mounted on the main shaft so as to be rotated therewith. The screen support has a plurality of marking holes provided at equal intervals around a circumference thereof and a screen is stretched across the support. The screen includes patterns associated with the desired mark which are provided in correspondence with the marking holes. A bracket is mounted on the main shaft under the screen support so as to be rotated with the main shaft. A plurality of supporters are supported by the bracket and function to individually support lens beds on which the lenses are respectively disposed.

Abstract: An apparatus for cutting ocular lens materials is disclosed which includes a rotating drive unit, a chuck for holding the lens material, a main shaft for transmitting a rotational force from the rotating drive unit to the chuck, and a coupling for supporting the main shaft and the chuck in a freely rotatable way; the chuck comprising finger members that are normally urged toward the side where they are closed and a cylinder portion for operation in such a way as to open the finger members; the chuck and the main shaft being connected concentrically; a passageway being provided for applying a working pressure from outside to the cylinder portion.

Abstract: A device for inhibiting aftercataracts being made of a material having a resilient property and having substantially circular shape so as to internally contact an equator of a lenticular capsule. The device includes an aperture at a central portion thereof.

Abstract: A material for one-piece intraocular lenses containing a copolymer whose main components are methyl methacrylate and at least one (meth)acrylate selected from an alkyl acrylate having a glass transition temperature of higher than 30.degree. C. and up to 100.degree. C. and a fluoroalkyl (meth)acrylate having a glass transition temperature of higher than 30.degree. C. and up to 100.degree. C. This material for one-piece intraocular lenses has excellent cutting-processability, grindability, machinability and suitable flexibility, and can be suitably used for not only one-piece intraocular lenses but also three-piece intraocular lenses.

Abstract: An intraocular lens system adapted to be implanted within a generally circular opening in an anterior wall of the capsular bag which normally contains the crystalline lens of an eye. The intraocular lens system includes a lens body having an annular groove which is formed in a peripheral portion thereof in a plane substantially perpendicular to an optical axis of the lens body. The lens body includes an optically effective portion located radially inside the annular groove, and an anterior lens portion and a posterior lens portion located on respective anterior and posterior sides of the annular groove. The intraocular lens system is secured in position within the circular opening such that an annular flap portion of the capsular bag which surrounds the circular opening is accommodated within the annular groove in the lens body.

Abstract: An ocular lens material consisting essentially of a polymer of an aromatic tetracarboxylic acid dianhydride with a silicon-containing diamine of the formula (I): ##STR1## wherein n is an integer of from 0 to 10.

Abstract: An ocular lens material comprising a copolymer prepared by polymerizing a monomer mixture comprising, as main components, (A) 15 to 40% by mole of a fluoroalkyl (silicon-containing alkyl) fumarate, (B) 35 to 55% by mole of an N-vinyl lactam, (C) 3 to 30% by mole of at least one of acrylic acid and methacrylic acid, and (D) 0.1 to 20% by mole of a crosslinkable monomer. The ocular lens material is excellent in all of transparency, oxygen permeability, mechanical strength and hardness. Further, the material is excellent in hydrophilic property in spite of its low water absorption.

Abstract: A process of producing a one-piece intraocular lens in which the lens includes an optical portion and at least one support portion produced integrally with each other, the process including the steps of (a) forming a first polymerized material into a lens blank, the lens blank including a convex portion to provide the optical portion of the intraocular lens, and a flange portion surrounding the convex portion, (b) applying, to one of opposite surfaces of the flange portion on a side of a convex surface of the convex portion, a monomer composition which is polymerizable to produce a second polymerized material different from the first polymerized material, the monomer composition including at least one polymerizable monomer, (c) polymerizing the monomer composition on the flange portion to provide a double-layer portion defined by the flange portion and the second polymerized material produced integrally with the lens blank from the monomer composition, and (d) forming the convex portion and double-layer porti

Abstract: A method for tinting a water-absorptive contact lens to have a mark tinted thereon, which comprises superimposing on a water-absorptive contact lens in the dry state a screen provided with a tinting pattern corresponding to the mark to be tinted on the contact lens, applying to the contact lens through the tinting pattern of the screen a dye solution containing a vat dye and an alkaline reducing agent, followed by insolubilizing the vat dye.

Abstract: An intraocular lens including a balloon member formed of an elastomer and adapted to be inserted into a capsular bag of an eye, an optically transparent fluid which is injected into the balloon member so that the balloon member expands and fills the capsular bag, and a tube provided on the balloon member and having a bore through which the optically transparent fluid is injected into the balloon member. The bore of the tube is filled with and fluid-tightly closed by a gel filler. The fluid serving as a lens medium is injected into the balloon member through the tube, with the gel filler inhibiting leakage of the fluid from the balloon member.