Contact lens with light blocking rings
SUBSTANCE: invention is designated to create contact lens which block penetration either of the ultraviolet light or blue light or both types of light into the lenses user pupils whereby the contact lenses pursuant to the innovation features block the above lights without deterioration of visual perception of the person that is secured due to the fact that the lens has optical zone having central round area and at least the first and the second concentric rings around it wherein the central round area and the second ring can essentially block the transfer of the ultraviolet light or blue light or both types of light up to less than 25%, besides the first ring is not the light blocking ring and it secures the transfer of 25% or more of the ultraviolet light, blue light, or both types of light.
EFFECT: efficiency of the visual perception enhancement.
12 cl, 1 dwg.
The scope of the invention
The invention relates to contact lenses. In particular, in the invention are contact lenses with many rings that filter ultraviolet (UV) radiation or blue light, or both types of radiation.
Background of invention
The use of glasses and contact lenses for the correction of visual acuity is well known. Although sunglasses, used to reduce eye exposure to ultraviolet radiation or locks available for purchase for a long time, comparable contact lenses are not widely available. However, in the prior art method of creating the contact lens continuous or graded area of the material absorbing the light or reflect light to reduce or block ultraviolet radiation entering the eyes of the person using the lens. A continuous zone of light absorbing material have disadvantages, namely that the person using the lens may not see a solid structure or shading within the field of view when looking through the lens. Graded area also has drawbacks related to the fact that the gradation can give the scattering of light, which is manifested in the deterioration of the image reaching the retina.
Brief description of drawing
Centerplease an imaging lens according to the invention.
Detailed description of the invention and the preferred implementation options
In the invention are contact lenses and methods for their manufacture, which essentially block one type of radiation: ultraviolet radiation or blue light, or both types of radiation, not letting him get into the pupil of the human eye using contact lenses. The novelty of the invention is that by creating multiple concentric rings of certain materials on the lens or inside it, the amount of light with the selected wavelength can be reduced or essentially eliminated without compromising visual perception of the person using contact lenses.
In one implementation of the invention creates a contact lens at least one surface of which contains, consists essentially of or consists of an optical zone having a Central circular region, and at least first and second concentric rings, where the Central circular region and the second ring are able to essentially block the transmission of ultraviolet radiation, blue light, or both.
"Lock essentially" means that the transmission of light is less than about 50%, preferably less than about 25%. Under the "ultraviolet" or "UV radiation" means radiation is within a wavelength of from about 100 to 400 nm. Under the "blue light" refers to radiation having a wavelength from about 400 to 515 nm.
The drawing shows one embodiment, lens 10, according to the invention. Shown in the front convex surface 11 of the lens has an optical zone 12. Inside the optical zone 12, there is a region 13, the Central circular area, blocking the light, centered on the geometric center of the lens 10 and is surrounded by alternating in its action concentric rings: do not block the light rings 14, 16 and 18 and blocking light rings 15, 17 and 19.
The area within the optical zone, which contains a Central circular area, blocking light, and a blocking ring light can have the same size as the optical zone, which in the standard contact lens is about 9 mm in diameter or less. Preferably, the area is less than 2 mm in diameter, or equal to 2 mm in diameter. The diameter of the Central circular area of approximately 0.3 to 1 mm, Any number of light blocking ring may surround the Central region, blocking the light, and the number of rings and their width will depend on the diameter of the optical zone containing a light blocking region and the ring, the larger diameter allows the use of more light blocking rings. Preferably, the width of each of the th of the light blocking and not blocking the light rings is approximately from 0.1 mm to 0.25 mm Each of the rings may have the same width or wider than the width of one or more other rings. Preferably, the light blocking and not blocking the light ring equidistant from each other.
The Central circular region that blocks light, and the surrounding concentric rings can be made from any suitable material that blocks the transmission of light to the desired degree. In one embodiment, the implementation of the Central circular area and blocking light rings are solid colored or painted areas. In alternative implementations Central circular region and rings made of opaque dots whose size and distance from each other are determined by the desired blocking transmission of light. For transmission to less than approximately 50% of the light can be used opaque points, which are approximately 0.1 mm in diameter and are spaced from each other at a distance of approximately 0,029 mm For transmission to less than 35% of the light the same points are from each other at a distance of approximately 0,013 mm
Suitable dyes include, without limitation, the polymerised dyes, such as arylacetamides or methacryloxyethyl 2,4-dihydroxybenzophenone connection polimerizuet dyes, such as 2,2',4,4'-tetrahydroxybenzophenone what he and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone. Additional dyes include, without limitation, 4-[(2,4-dimetilfenil)azo]-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazole-3-one, 1,4-bis[(4-were)amino]-9,10-anthracenedione and 1-hydroxyl-4-[(4-were)amino]-9,10-anthracenedione.
As another alternative, can be used reactive dyes. Suitable dyes of this type include, but without limiting the above, 4-(4,5-dihydro-4-((2-methoxy-5-methyl-4-((2-sulfoxy)ethyl)sulfonyl)phenyl)azo-3-methyl-5-oxo-1H-Orasul-1-ilen derived benzosulfimide acid, 7-(acetylamino)-4-hydroxyl-3-((4-sulfoxide)sulfonyl)phenyl)isoprostane 2-naphtalenesulfonic acid, trinacria salt of 5-((4,6-dichloro-1,3,5-triazine-2-yl)amino-4-hydroxy-3-((1-sulfon-2-naphthalenyl-azo-2,7-naphthalenedisulfonic acid, 29H,31H-phthalocyaninato(2-)-N29N30N31N32)-sulfo((4-((2-sulfoxy)ethyl)sulfonyl)phenyl)aminosulfonyl derived copper, 4-amino-5-hydroxy-3,6-bis((4-((2-sulfoxy)ethyl)sulfonyl)phenyl)azo)Terentieva salt 2,7-naphthalenedisulfonic acid, and combinations thereof.
Another alternative is organic or inorganic pigment, suitable for use in contact lenses, or combinations of such pigments. Exemplary organic pigments include, without limitation, phthalocyanine blue, phthalocyanine green, carbazole violet is th, vat orange #1, and the like, and combinations thereof. Examples of useful pigments used include, without limitation, iron oxide black, iron oxide brown, iron oxide yellow, iron oxide red, titanium dioxide, and the like, and combinations thereof. In addition to these pigments can be used in soluble and insoluble dyes, including, without limitation, dyes based on dichlorotriazines and vinylsulfonic. Used dyes and pigments are available for purchase.
Choose a dye or a pigment may be combined with one or more prepolymers, or linking the polymer, and the solution for forming the dye used to obtain semi-transparent or opaque layers used in the lens according to the invention. Other admixtures used in the dyes of contact lenses can also be used. Binding polymers, solutions, and other impurities, used in the dye layer according to the invention, are known and are either commercially available or methods for their manufacture are known.
In yet another variant implementation of the Central circular area and blocking light rings, creating a blocking ultraviolet radiation, can be formed of photochromic compounds or mixtures, which are well known. Photochromic materials include, without limitation, the trail is the following classes of materials: chromenes, such as naphthopyrane, benzopyrane, indinanapolis, phenanthroline; spiropyran, such as Spiro(benshengren)naphthopyrans, Spiro(indoline)benzopyrane, Spiro(indoline)naphthopyrans, Spiro(indoline)chinaberry and Spiro(indoline)Pirani; oxazine, such as Spiro(indoline)nafoxidine, Spiro(indoline)pyridobenzoxazine, Spiro(benshengren)pyridobenzoxazine, Spiro(benzoindole)nafoxidine and Spiro(indoline)benzoxazines; dithizonate mercury, fulgide, fulginiti and mixtures of such photochromic compounds.
Additional suitable photochromic materials include, without limitation, ORGANOMETALLIC dithizonate, such as (arylhydrazines (arylazo)-tiarawine acid), for example, dithizonate mercury; and fulgide and fulginiti, nafoxidine, spirometery; the polymerized spirometery and spirometery; the polymerized fulgida, curable naphthacenedione; curable spirooxazine; and the polymerized polyalkoxysiloxanes naphthopyrane. Photochromic materials may be used alone or in combination with one or more other suitable compatible photochromic materials.
Other photochromic materials include inden-condensed naftiran selected from indeno[2',3':3,4]oil[1,2-b]Piran and indeno[1',2':4,3]oil[2,1-b]Piran, where the position of the 13 inden-condension the frame naphthopyrane is unsubstituted, monosubstituted or disubstituted, provided that, if the position of the 13 inden-condensed naphthopyrane is disubstituted, the substituting groups do not together form norbornyl; and (ii) the group that extends the PI-conjugated system inden-condensed naphthopyrane attached in position 11, where the group is a substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl or a group represented by the formula: -X=Y or-X'≡Y', where X, X', Y, Y' are as described below and presented in the formula of the invention; or a group that extends the PI-conjugated system inden-condensed naphthopyrane, together with the group attached in position 12 inden-condensed naphthopyrane or together with the group attached in position 10 inden-condensed naphthopyrane form a condensed group, provided that the condensed group is not a benzo-condensed matter group, which are more specifically described in US no 11/102047, entitled "Ophthalmic Devices Comprising Photochromic Materials Having Extended Pi-Conjugated Systems and Compositions and Articles Including The Same", registered on April 08, 2005. Other suitable photochromic compounds are naphthopyrane having a reactive group, such as described more specifically in US no 11/101979, entitled "Ophthalmic Devices Comprising Photochromic Materials ith Reactive Substituents", registered 8 April 2005. Specific non-limiting examples of suitable photochromic compounds shown in the formula below.
Where R1-R10may contain H, monosubstituted alkyl or aryl group, which may optionally contain a heteroatom such as O, N or S, alkenyl or alkylamino group, and which may be combined to form a condensed or unfused cycles, provided that one or more of the R groups contain curable group such as methacrylate, acrylate, acrylamide, methacrylamide, fumarate, stielow group, N-vinylamide group, preferably a methacrylate group. Specific non-limiting examples of suitable naphthopyrane compounds include compounds described by the following formulas.
Photochromic compound I
Photochromic compound II
Photochromic compound III
Photochromic compound IV
Photochromic compound V
Photochromic compound VI
Photochromic compound VII
Photochromic compound IX
Photochromic compound X
Photochromic compound XI
Photochromic compound XII
The number of used dye pigments, dyes, pigments or photochromic material is effective to achieve the blocking of UV radiation blocking blue light or both types of radiation. The specific amount of the substance used will also depend on the selected material of the lens, as well as the thickness of the lens.
The invention can be used to create a hard or soft contact lenses made of any known material or a material suitable for the manufacture of such lenses. Preferably, the lenses according to the invention are soft contact lenses having a water content from about 0 to 90 percent. More preferably, the lenses are made of monomers containing a hydroxy-group, carboxyl group, or both types of groups, or they are made of a silicone polymers, such as siloxanes, hydrogels, silicone hydrogels, and combinations thereof. The material used for forming lenses according to the invention, can be obtained for the odd reactions of mixtures of maromero, monomers and combinations thereof, together with such impurities as initiators of polymerization. Suitable materials include, without limitation, silicone hydrogels, made of silicone macromeris and hydrophilic monomers. Examples of such silicone macromeris include, without limitation, metakrilovoy a polydimethylsiloxane with hydrophilic side groups; polydimethylsiloxane macromer with a curable functional group and a combination thereof. They can also be manufactured using polysiloxane of maromero, composed of hydrophilic monomers; or macromeris containing polydimethylsiloxane blocks or blocks of polyether.
Suitable materials can also be obtained on the basis of combinations Oxiperm and isoperla. Hydrophilic monomers may be included in the composition of these copolymers, including 2-hydroxyethylmethacrylate ("HEMA"), 2-hydroxyethylacrylate, N,N-dimethylacrylamide ("DMA"), N-vinyl pyrrolidone, 2-vinyl-4,4'-dimethyl-2-oxazoline-5-he, methacrylic acid and 2-hydroxyethylmethacrylate. The composition may include additional siloxane monomers, such as Tris(trimethylsiloxy)cellproperties or siloxane monomers.
Materials for the manufacture of contact lenses are well known and available for purchase. In one non-limiting in what the version of the implementation of the used material is a hydrogel-based HEMA, more preferably etafilcon And linking the polymer formed from linear statistical block copolymers MAA, HEMA and lauriemittiet (LMA), linear statistical block copolymers of MAA and HEMA; linear statistical block copolymers of HEMA and LMA; or homopolymer HEMA. Etafilcon And is typically a composition of 100 parts by weight of HEMA, from about 1.5 to about 2.5 parts by weight of MAA, from about 0.3 to about 1.3 parts by weight of etilenglikolevykh, from about 0.05 to about 1.5 parts by weight of 1,1,1-trimethylolpropane and from about 0.017 to about 0.024 parts by weight podsvechivaya dye. Preferably, etafilcon And is used with linear statistical block copolymer MAA, HEMA and LMA in the ratio of 0.47 MAA to 100 HEMA to 4,14 LMA or linear statistical block copolymer of HEMA and MAA in a ratio of 99.9 HEMA and 0.1 MAA to 99.5 HEMA and 0.5 MAA.
The Central region, blocking the light, and the rings can be applied or printed on one or more surfaces of the lens, or can be printed on one or more surfaces of the workpiece, which will be deposited or harden the material forming the lens. In a preferred method for forming lenses, including the construction according to the invention, can be used thermoplastic optical workpiece manufactured by the I of any suitable material, including, without limitation, cyclic polyolefins and polyolefins, such as polypropylene, polystyrene liquid polymers, polymers based cycloolefin, such as TOPAS, which are present in an amorphous copolymer on the basis of cycloolefin and ethylene, commercially available from Ticona, a polymer obtained by polymerization of norbornene compounds in the metathesis reaction to the disclosure of the cycle, followed by hydrogenation, such as Zeonor, which are available for purchase from the Corporation, Zeonor, glass, metal or quartz. Blocking the light of the scope and rings are applied to the desired portion of the forming surface of the workpiece. Under the "forming surface" means the surface of the workpiece or half of the blank used for forming the lens surface. Application may be by spraying, printed printing, stamp printing, coating with a brush or stamping. Preferably, the application is printed by printing, as set forth below.
Metal plate, preferably made of steel, more preferably stainless steel, is covered with a photoresistive material which when hardened is capable of becoming waterproof. Creates a Central part that blocks the radiation, and rings, and then reduced to the desired size using any the number of methods, such as a photographic technique, when placed over the metal plate, and the photoresistive material cures.
The plate is washed sequentially with an aqueous solution, and the resulting image is etched into the plate to a suitable depth, for example, approximately 20 μm. The dye-containing binder polymer solution and the pigment or dye is then applied to the elements to fill with his help recesses. Silicone gasket having a geometry suitable for use when printing on the surface and changing the stiffness, usually from 1 to 10, press to the image on the plate to remove the dye, then the dye slightly dried by evaporation of the solution. Then the gasket is pressed against the forming surface of the optical preform. Procurement escaped during the period of time up to 12 hours to remove excess solvents and oxygen, after which the blank is filled with the lens material. Additional half of the workpiece is then used to ukomplektovana blanks assembled, and the workpiece is assembled is placed in conditions suitable for curing the material used lenses. Such conditions are well known in the art, and will depend on the selected material of the lens. When the curing is completed the network, and the lens is removed from the workpiece, it is balanced in the buffer salt solution.
In the preferred implementation uses pure forprimary layer, where the layer of prepolymer covers at least the Central region, blocking light, and a blocking ring light, and preferably forms the integrity farthest from the center of the lens surface.
1. Contact lens containing an optical zone having a Central circular region and at least first and second concentric rings around it, where the Central circular region and the second ring is able, essentially, to block the transmission of ultraviolet radiation, blue light, or both types of radiation to less than 25%, and the first ring is not blocking the light ring that enables the transfer of 25% or more ultraviolet radiation, blue light, or both types of radiation.
2. The lens according to claim 1, additionally containing the third, fourth, fifth, and sixth concentric rings, where the fourth and sixth rings are able, essentially, to block the transmission of ultraviolet radiation, blue light, or both types of radiation.
3. The lens according to claim 1, in which a Central circular region centered on the geometric center of the lens and has a diameter of approximately 0.3 to 1 mm.
4. The lens according to claim 2, in which the centre is supplemented flax circular region centered on the geometric center of the lens and has a diameter of approximately 0.3 to 1 mm.
5. The lens according to claim 1, in which the width of each ring is approximately from 0.1 to 0.25 mm
6. The lens according to claim 2, in which the width of each ring is approximately from 0.1 to 0.25 mm
7. The lens according to claim 3, in which the width of each ring is approximately from 0.1 to 0.25 mm
8. The lens according to claim 4, in which the width of each ring is approximately from 0.1 to 0.25 mm
9. The lens according to claim 1, in which a Central circular area and blocking light ring containing a solid-colored area.
10. The lens according to claim 1, in which a Central circular region and rings contain opaque pixels.
11. The lens of claim 10, in which the dots have a diameter of approximately 0.1 mm and separated from each other by a distance approximately 0,029 mm
12. A method of creating a light blocking contact lenses, containing the step of creating a contact lens having an optical zone containing a Central circular region and at least first and second concentric ring around it where the Central circular region and the second ring is capable of substantially blocking the transmission of ultraviolet radiation, blue light, or both types of radiation to less than 25%, and the first ring is not blocking the light ring, which ensures the transfer of 25% or more ultraviolet radiation, blue light, or both types of radiation
SUBSTANCE: invention is designated to create contact lenses which correct refractive perception of the lenses user with due account for the pupil size and the Stiles-Crawford effect of the first order that enhance the efficiency of the light distribution under all viewing conditions; the above result is secured due to the lens constructing procedure assuring multifocal optical construction with at least two radiosymmetrical optical zones and upscale the multifocal optical construction on the basis of the size of the pupil by means of determination of the effective size of the pupil and regulation of the radius of each optical zone pursuant to the Stiles-Crawford effect for the correction of the sharpness of longsighted vision of the lens user as needed.
EFFECT: enhancement of the efficiency of light distribution under all viewing conditions and enhancement of the efficiency of the sharpness of longsighted vision of lenses users.
9 cl, 2 dwg.
SUBSTANCE: full range of multifocal lenses is made by using three aspherical back surfaces, which are symmetrical with respect to rotation, the structure of the basic curves of which is a function of the refractive power.
EFFECT: design of multifocal contact lenses, which are simple to make but are comfortable during use and are provided with means of correcting presbyopia.
SUBSTANCE: methods are developed for making templates used during process design, measurement and making contact lenses, where, according to the invention, the templates are obtained using algorithms described in the claim.
EFFECT: easy manufacture of coloured contact lenses having a complex geometry.
7 cl, 9 dwg
SUBSTANCE: design of contact lenses can be optimised virtually, thus eliminating the need for iterative design-test on-eye and re-design cycles. Method for designing a contact lens comprises the steps of selecting an eye model; selecting optical performance metrics for vision correction with a lens on-eye using the model eye; providing a first lens having a first design, the design comprising at least a first optical zone; simulating the flexure of the first lens on-eye in order to determine a shape and performance measurements for the first lens on-eye; comparing the performance metrics with the performance measurements; selecting the first design as the contact lens design if it meets the performance metrics and correcting the first design to better meet such performance metrics if it does not; wherein the model represents lenses as nodes and elements of a finite element mesh such that a load or a series of loads, simulating forces in vivo, are applied to the lens while it is on-eye.
EFFECT: design of contact lenses, where their flexure is taken into account in order to improve comfort and simplify use of contact lenses which do not have complex design of the back surface.
12 cl, 4 dwg
SUBSTANCE: in one of the versions of the invention, a shifting contact lens has an optical zone, having at least two far vision zones which determine far vision optical power, and at least one near vision zone which determines near vision optical power, wherein the lens additionally has a horizontal meridian, where the value of the far vision optical power on the horizontal meridian or over the horizontal meridian is greater than 50% of the total correcting power of the optical zone, and the value of the far vision optical power below the horizontal meridian is less than 50% of the total correcting power of the optical zone.
EFFECT: design of shifting multifocal lenses use of which is independent of the size of the pupil and is not sensitive to the pupil.
11 cl, 7 dwg
SUBSTANCE: image forming apparatus has an image forming lens unit, comprising at least one lens having a defined effective aperture and at least one optical element associated with said at least one lens and configured to provide high depth of focus of said apparatus. The optical element is configured as a non-diffraction optical element which affects phase and sets phase shift through spatially separated optically transparent sections of phase shift with low spatial frequencies, differently affecting phase of light passing through and forming a given pattern. The position of at least one section of phase shift on the optical element within the plane of the effective aperture of the lens is defined by at least the size of said aperture so as to ensure maximum optical transfer function during defocusing of the image forming apparatus.
EFFECT: providing an optical method of increasing depth of focus.
34 cl, 44 dwg
SUBSTANCE: silicone-hydrogel composition for soft contact lenses contains a silicone monomer N,O-bis(trimethylsilyl)acrylamide and 2-hydroxyethylmethacrylate, to which a water-soluble monomer N-vinyl-2-pyrrolidone or N,N-dimethylacrylamide is added to improve hydrophilic properties, as well as a cross-linking agent, such as ethylene glycol dimethacrylate or divinylbenzene, to improve hydrophilic properties, high content of water, high oxygen permeability, good elongation and optical transparency.
EFFECT: obtaining hydrophilic lenses with high content of water and high oxygen permeability.
7 cl, 2 tbl
SUBSTANCE: shadow contact lenses are shaped with using at least the one first image of the first colour and the first configuration, and at least the second image of the second colour and the second configuration; the second image is able to shadow the first image.
EFFECT: creation of the shadow contact lenses with the deepened image of a natural appearance when carrying the lenses.
17 cl, 3 dwg
SUBSTANCE: according to one version of the invention, the intraocular lens includes a rear optical element and a front optical element. One optical element provides compensation for radial-symmetrical aberration and the other provides compensation for radial-asymmetrical aberration.
EFFECT: design of multiple-surface and multiple-element intraocular lenses in which the surfaces can provide compensation for different aberrations and off-axis aberrations.
27 cl, 4 dwg
SUBSTANCE: on the end surface of an eye contact lens, having an outer front and rear surfaces, there are two patches lying in parallel on opposite sides of the end surface of the lens, and on its front surface there is a film made from a selenium solution on which a protective coating made from a solution of methoxyethyl mercuric acetate is deposited. On top of these coatings and the lens, there are two annular concentric cuts 11, 12, lying coaxial to the centre of the lens, filled with black dye.
EFFECT: easy placement and removal, alignment and placing on the eye cornea, reduced injuries, high efficiency when used in different atmospheric conditions.
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