Method for manufacture of ophthalmological lenses equipped with passive system of painting based on events
SUBSTANCE: method comprises formation of an ophthalmic lens consisting of soft biocompatible material and encapsulation of a colouring mechanism based on events within the said lens. The colouring mechanism is capable of inducing a visual indication in the lens based on the occurrence of a predetermined event. Lens moulding comprises addition of a monomer reaction mixture to the front curved surface of the casting mould, to the rear curved surface of the mould, or both, placement of the rear curved surface of the casting mould adjacent to the front curved surface, curing of the monomer reaction mixture, shaping of the front and rear curved surfaces of the casting mould and lens extraction. The colouring mechanism further comprises a rigid insert.
EFFECT: ability to track the properties of the eye environment using passive colouring mechanisms based on events.
24 cl, 6 dwg
FIELD: physics, optics.
SUBSTANCE: correcting optical lens, adapted to move together with the eye of the user and change the refracting power thereof, comprises a first radial optical area having a first refracting power which, coupled with the refracting power of the eye of the user, results in a first effective refracting power which rises as the radius of the first radial optical area increases, and a second radial optical area having a second refracting power which, coupled with the refracting power of the eye of the user, results in a second effective refracting power which falls as radius of the second radial optical area increases. The first effective refracting power is greater than the second effective refracting power. The dimensions and refracting power of the first and second radial optical areas are intended to weaken visibility of defocused radiation for the user.
EFFECT: eliminating or minimising visibility of ghost images through control of the sign of spherical aberration or other asphericity which depends on a specific area.
20 cl, 9 dwg
FIELD: physics, optics.
SUBSTANCE: contact lens is stabilised by development of design parameters of at least one of stabilising zones. Said zone is perfected by description of lens structure parameters by mathematical definitions, simulation of lens structure with the help of model that features the balance of moments of motions and selection of structure proceeding from the results of said simulation. At least one of stabilising zones is defined by one or more parts of variable depth in every stabilising zone. Maximum depth of at least one said stabilising zone makes 0.010-0.060 mm.
EFFECT: better stabilisation.
7 cl, 12 dwg, 4 tbl
SUBSTANCE: invention relates to organosilicon prepolymers, containing fragments, which absorb ultraviolet (UV) radiation. Claimed is an actinically cross-linkable polymer, which contains cross-linkable polysiloxane polymer units, formed from one or several hydrophilic vinyl monomers, and double photofunctional polymer units, formed from a polymerisable compound, containing an ethylene-unsaturated group, a photoinitiating fragment and a fragment, absorbing UV-radiation, or a latent fragment, absorbing UV-radiation. Soft silicone hydrogel contact lenses, manufactured from the claimed prepolymer, are also claimed.
EFFECT: it is possible to manufacture the high-quality contact lenses with low expenditures, providing high homogeneity and reproducibility of an initial lens shape.
14 cl, 16 ex
SUBSTANCE: invention refers to transparent silicone hydrogels. What is presented is silicone hydrogel prepared by polymerisation of mixture of monomers containing (a) 30-98 wt % of at least one silicone (meth)acrylamide monomer and (b) 1-50 wt % of at least one non-silicone (meth)acrylamide monomer containing two or more hydroxyl groups in its molecule; wherein weight percentage is calculated from a total amount of monomer and polymer components in the monomer mixture, and a total amount of monomers (a) and (b) makes 90 wt % or more in relation to the total amount of the monomer and polymer components in the monomer mixture. There are also presented a medical device, an ophthalmic lens and a contact lens made of the above silicone hydrogel.
EFFECT: presented silicone hydrogel has the high content of acrylamide monomer and the excellent balance of humidity, elasticity, wetting ability and transparency, and is applicable to produce lenses having the excellent characteristics.
19 cl, 4 tbl, 27 ex
FIELD: physics, optics.
SUBSTANCE: displaceable presbyopic contact lens comprises an optical zone, a lens portion surrounding the optical zone, a conical portion surrounding the lens portion from the outside to the edge of the contact lens and pseudotruncation which is asymmetrical about the vertical meridian. The point where the optical zone borders with the lens portion is an optical-lens boundary. The point where the lens portion borders with the conical part is a lens boundary of the edges of the cone. The structure of the lens surface is defined by the equation: T3=T1+(T2-T1)*(Sin ((P3-P1)/(P2-P1) *90))n , where P1 is the distance from the centre of the lens to the optical-lens boundary, T1 is the thickness of the optical lens boundary, P2 is the distance from the centre of the lens to the lens boundary of the edges of the cone, T2 is the thickness of the lens boundary, P3is an arbitrary point on the contact lens located between and including P1 and P2, and T3 is the thickness defined at point P3.
EFFECT: facilitating displacement of the lens owing to its support on the lower lid and more comfort when wearing the lens.
6 cl, 7 dwg
FIELD: physics, optics.
SUBSTANCE: contact lens comprises an optical zone, a peripheral zone surrounding the optical zone, a front surface and a back surface having movement elements thereon. The movement elements are dimples. The dimples are spaced apart such that their centres are 300-400 mcm apart. The dimples have a depth between 20 mcm and 30 mcm and a diameter between 100 mcm and 300 mcm.
EFFECT: improved lens movement.
7 cl, 4 dwg
FIELD: physics, optics.
SUBSTANCE: lens comprises an optical portion having a central vision region and a peripheral region and extending from the centre of the lens to the outer periphery, and a carrier portion connected to the outer periphery of the optical portion by a blending zone and extending from the outer periphery of the optical portion to the outer periphery of the carrier portion. The has an optical power distribution that creates on-axis and off-axis myopic defocus to reduce or remove on-axis and off-axis defocus created by the optical system of the eye of a patient wearing the lens. On-axis and off-axis defocus is created by increasing positive optical power for light rays passing through the central vision and peripheral regions of the optical portion. The optical power distribution is described by a compound mathematical function that includes at least first and second error functions.
EFFECT: preventing or slowing progression of myopia without noticeable deterioration of central vision of a patient.
20 cl, 4 dwg
SUBSTANCE: invention relates to compounds described by formula I. In general formula I: Y-L2-Z-L1-X, Z stands for bivalent radical of formula (1a):
in which R3a, R3b, R3c and R1z stand for hydrogen; X stands for monovalent radical of formula
in which R1 and R2 independently represent C1-C4-alkyl group, optionally substituted with phenyl; A stands for hydroxygroup or di-C1-C4-alkylaminogroup; B stands for 6-membered heterocycle with two nitrogen atoms as heteroatoms; L1 stands for fragment -C(O)L3C(O)-, where L3 stands for linear or branched C1-C4-alkylene radical, or B stands for covalent bond and L1 stands for fragment -C(O)L3C(O)-O-(CH2)p-O-, where p stands for integer number, equal from 1 to 5; or X stands for diphenylphosphine oxide group, L1 stands for fragment -C(O)L3C(O)-O-(CH2)p-Ph-, where Ph is substituted with two C1-C4-alkyl groups, where p stands for integer number, equal from 1 to 5; Y stands for monovalent radical -O-C(O)-C(R14)=CH2, where R14 stands for C1-C4-alkyl group; and L2 stands for bridge -(CH2)2-. Invention also relates to ophthalmological lens, containing polymer, based on invention compounds.
EFFECT: obtained are novel compounds, which can be applied for manufacturing ophthalmological lenses absorbing UV-radiation.
5 cl, 1 tbl, 8 dwg, 5 ex
FIELD: physics, optics.
SUBSTANCE: method of making a contact lens includes dosing material of optical quality into the front curvature matrix of a contact lens; placing a rear curvature matrix on the surface of the material and connecting the front and rear curvature matrices to form a contact lens matrix and curing the material by varying the intensity of curing light along the profile of the contact lens matrix such that the central part of the contact lens becomes stiffer than the peripheral part. A second version of the method includes depositing a first reaction inhibitor on the surface of the front curvature matrix of the contact lens; dosing material of optical quality into the front curvature matrix; depositing a second reaction inhibitor on the surface of the rear curvature matrix; placing the rear curvature matrix on the surface of the material of optical and superposition thereof with the front curvature matrix to form a contact lens matrix. The first and second reaction inhibitors must have a different composition and concentration. Material in the contact lens matrix is cured to form a predetermined stress profile.
EFFECT: reduced lens stabilisation requirements.
SUBSTANCE: series of lenses for correcting the peripheral defocusing of an eye comprises several soft contact lenses. Each of the soft contact lenses of the series has a central optical force general for all lenses within the series. Each of the soft contact lenses of the series has the same optical power differential specified in a number of various optical power differentials for the lenses within the series. A method for correcting the peripheral defocusing of an eye involves selecting a first soft contact lens in the above series and putting it in the eye; assessing a vision quality to show the presence of hypercorrection or undercorrection in the peripheral retina; replacing the first lens for an alternative lens from the series of soft contact lenses having a higher optical power differential, if the undercorrection has been stated after putting the first lens in, or a lower optical power differential, if the hypercorrection has been stated after putting the first lens in.
EFFECT: lower risk of the hyper- or undercorrection of the defocusing in the peripheral retina of a specific eye, provided delay of myopia progression.
8 cl, 7 dwg
FIELD: medicine: measurement equipment.
SUBSTANCE: lens can be also used in ophthalmology and for decorative purposes. Contact lens has transparent area in the center. Onto working (internal) part of the surface there is ring-shaped groove filled with thermal sensitive material covered with heat-conducting material. Measurement marks are applied onto surface of lens.
EFFECT: simplified way of measurement; reliable eye/measurement equipment contact; reduced sizes and weight of the device; prevention from random traumatism.
6 cl, 1 dwg
FIELD: medicine, ophthalmology.
SUBSTANCE: the present innovation deals with preparing soft contact lens for prolonged application. For this purpose one should place lens into perfluorodecalin solution and add 0.1% adenosine-triphosphoric acid solution, then, during 30 min, it should be passed through 100% oxygen solution at the rate of about 3-4 l/min. High saturation degree with oxygen followed by its gradual release provides the chance for lens' prolonged application and improved curative impact upon corneal tissues and ocular conjunctiva.
EFFECT: higher efficiency oxygen supply.
FIELD: polymer materials.
SUBSTANCE: composition represents biphasic silicone-hydrogel material in the form of in series arranged interpenetrating lattices consisting of cross-linked (i) polysiloxane, which is reaction product of vinyl-containing component including oligosiloxane/polysiloxane mixture and hydride-containing component, which is oligomer, and (ii) hydrophilic polymer, which is cross-linked (co)polymer of N-vinylpyrrolidone, 2-hydroxyethyl methacrylate, acrylamide, and dimethylacrylamide.
EFFECT: improved performance characteristics of polymer composition and simplified method for preparation thereof.
2 tbl, 11 ex
FIELD: medical industry; method of manufacture of the plastic lenses and the plastic lens.
SUBSTANCE: the invention is pertaining to the field of medical industry, in particular, to the method of manufacture of the plastic lenses, which may be used in the capacity of glasses plastic lenses. The method of manufacture of the plastic lens includes the phase of polymerization of the mixture (1) of the prepolymer produced by mixing and interaction of sulfur taken in the amount from 0.1 mass % up to 10 mass % counting upon the total amount of the mixture and containing the epithio-group compound, (2) of polyisocyanate compound and (3) polythiol compound. The invention also presents the lenses manufactured by the given method. The technical result of the invention is production of the plastic lenses with the high index of diffraction, the high Abbe number and the high mechanical strength.
EFFECT: the invention ensures production of the plastic lenses with the high index of diffraction, the high Abbe number and the high mechanical strength.
20 cl, 1 tbl, 14 ex
SUBSTANCE: method involves keeping rigid gas-permeable contact lenses in glass jar on rotating toggle switch. Ball mixture, distilled water and filing powder are used as polishing material. Polishing time is equal to 8 h Lenses manufactured from material of high Dk coefficient value equal to or greater than 86 units. Medium Dk coefficient value cases of Dk equal to 85-60 units require 10 h. Soft material cases of Dk<60 require 14 h.
EFFECT: high quality of lens surface with optical properties being retained; simultaneous polishing of several lens surface zones.
FIELD: optical engineering.
SUBSTANCE: plastic lens intended to absorb ultraviolet light with wavelength around 400 nm may be made from composition comprising (A) lens material monomer containing diethylene glycol bis(allyl) carbonate, (B) organic peroxide-based polymerization initiator, (C) cobalt compound selected from at least taw following: CoO-Al2O3 and CoO-Al2O4, and (D) at least one ultraviolet light-absorbing compound selected from 2-hydroxy-4-octyloxybenzophenone, 2,2',4,4'-terahydroxy-4-octyloxybenzophenone, and 2,2',4'-trihydroxy-4-octyloxybenzophenone. Invention also concerns lens manufacture method comprising: mixing compartment A, compartment B, fluid with cobalt containing compartment C with dispersant, and compartment D; pouring resulting mixed fluid into mold; and polymerization of the fluid in mold to form plastic lens.
EFFECT: improved quality of lens.
17 cl, 2 tbl, 9 ex
FIELD: medicine, namely ophthalmology.
SUBSTANCE: elastic intraocular lens with hydrophilic properties contains optical and supporting sections and is made of polymer material on basis of methacrylate manufactured by photo-hardening of composition consisting of mixture: 2,2-dimethylate-2-phenylacetatephenon, 2,4-ditretbutylquinone, oligourethanemethacrylate with number of oxipropylene groups n=36, monomethacrylic ether of ethylene glycol, methacrylic acid.
EFFECT: creation of elastic intraocular lens having hydrophilic properties with increased strength and elasticity, increased resistance in biologically active environments (eye chamber moisture), increased resistance to oxidative processes and albumen absorption processes on the surface.
FIELD: physics; optics.
SUBSTANCE: present invention relates to ophthalmology and is aimed at designing a multi-focal contact lens, which provides for accurate vision correction for all focal distances. This outcome is achieved due to that, the proposed multi-focal contact lenses are at least partially made from sensitive polymer gel, which has sufficiently short reaction time so that, the user does not feel the change and can always see clearly.
EFFECT: design of a multi-focal contact lens, which provides for accurate vision correction for all focal distances.
SUBSTANCE: invention concerns medicine, particularly ophthalmology, and can be applied in treatment of dystrophic, inflammatory and post-operation cornea diseases by soft therapeutic lenses made of silicon gel. Lenses with 1.0-1.5 mm movement amplitude are used for post-keratoplasty and aphakia; lenses with minimum movement amplitude up to 0.3 mm are used for cornea tissue defects; more mobile lenses with movement amplitude up to 1.0 mm are used for hydropic cornea states; lenses with higher movement amplitude up to 1.5 mm are used for lacrimal insufficiency; then selected lenses are placed for soaking in solution of water-soluble medication for 3-4 hours, and later placed onto eyes.
EFFECT: accelerated recovery of cornea epithelium defects after excimer laser operations, post-keratoplasty states, cornea perforations, dystrophic states, epithelium abrasions, recurrent erosions.
FIELD: process engineering.
SUBSTANCE: invention relates to techniques of producing soft contact lenses. Proposed method comprises dissolving coloring agent in hydrophilic monomer represented by N-vinylpyridone, copolymerising obtained solution with hydrophobic monomer, i.e. methyl methacrylate in the presence of divinyl crosslinking agent. It further on comprises processing of obtained polymer mix and producing contact lenses. Proposed method differs from known ones in that it uses anthraquinone dye as a dye and in that monomer copolymerisation is performed under effect of ionising radiation.
EFFECT: simplified technology, improved physical-chemical properties on lenses.
4 cl, 1 tbl, 9 ex