Abstract: An intraocular lens includes a optical body including a posterior concave rface with a first radius of curvature, a periphery and a central, axially aligned opening that enhances liquid circulation in the eye, with the ratio of the height of the optical body to the overall height of the lens being between about 0.25 to about 0.5; a positioning element connected to the optical body periphery and including a periphery and a posterior concave surface with a second radius of curvature greater than the first radius of curvature, a ratio of the first to second radii of curvature being between about 0.31 to about 0.

Abstract: The keratometer comprises an illumination system made as the following components located before a cornea: a light source, an objective lens, ring-shaped measuring marks interposed between the light source and the objective lens on the focal surface of the illumination system symmetrically with respect to the optic axis of the objective lens, and a cone-shaped mirror.The cone-shaped mirror is interposed between the objective lens of the illumination system and the cornea and is shaped as a cone frustum having its inner surface provided with a reflecting coating. The keratometer comprises also a unit for recording the images of the measuring marks and a projection lens, the latter being composed of two elements one of which is in fact the objective lens of the illumination system and the other element is located on the optic axis of the illumination system objective lens between the latter and the unit for recording the images of the measuring marks.

Abstract: An optical body 1 in an intraocular prosthetic lens is made up of a first planoconvex optic element 3 and a second planoconvex optic element 4, both interconnected by their bases. An optic axis 5 of the first planoconvex optic element 3 is offset with respect to the optic axis 6 of the second planoconvex optic element 4.

Abstract: An intraocular lens comprises a UV-absorbing optic lens made of a polymer composition having the following light transmission spectrum in its visible postion at the following wavelengths: 400 nm, 10 to 27 percent of light transmission; 420 nm, 21 to 37 percent; 440 nm, 37 to 55 percent; 460 nm, 52 to 63 percent; 480 nm, 70 to 78 percent; 560 nm, 85 to 90 percent; 520 to 650 nm, 90 to 95 percent, and incorporating ingredients taken in the following mass percent ratio:______________________________________ UV-absorbing material 1.65 to 3.0 (4-alkoxy-2-hydroxybenzophenone or tetraoxybenzophenone) fat-soluble dye-4-(2,4-dimethylphenylazo)- 0.011 to 0.016 5-methyl-2-phenyl-1,2,3-triazole dibutylphthalate 4.8 to 5.0 polymethylmethacrylate to make up 100%.

Abstract: A biocompatible material which is the product of graft-copolymerization of a water-soluble vinyl and/or an acrylate monomer with a sorption complex of polysilicic acid and collagen that has been rid of pigments, glycoproteins and proteoglycans, or a product obtained by virtue of chemical destruction, with the aid of hydrofluoric acid, of the afore-mentioned product of graft-copolymerization, containing up to 25 mass percent of polysilicic acid (in terms of SiO.sub.2), up to 12 mass percent of protein, and maximum 1 10.sup.-6 mole/g of an anion of hydrofluoric and hydrofluoric acids, methods of making the same and products produced thereby.

Abstract: An optical body, a positioning element, and a supporting element are shaped as an integral unit and have the same radius of curvature that provides for full adherence of the integral unit to an intact natural lens. The distance between the diametrically opposite portions of the supporting element is at least equal to the distance between Zinn's zonules on which the corrective lens rests.

Abstract: A ball falls freely onto an eyelid-covered cornea, and the kinetic energy of the ball is conversed into a force causing deformation of the cornea. The amount of the ball rebound varies depending on the amount of intraocular pressure and the latter is judged against the amount of the ball rebound.An ocular tonometer has a tubular housing, wherein provision is made for a free falling of the ball kept by a special holder at one of the ends of the housing. The opposite end of the housing is placed on the eyelid so that the falling ball interacts with the cornea through the eyelid. The amount of the ball rebound characteristic of the amount of intraocular pressure, is registered either with the aid of a scale or by a special measuring instrument.

Abstract: A ball falls freely onto an eyelid-covered cornea, and the kinetic energy of the ball is conversed into a force causing deformation of the cornea. The amount of the ball rebound varies depending on the amount of intraocular pressure and the latter is judged against the amount of the ball rebound.An ocular tonometer has a tubular housing, wherein provision is made for a free falling of the ball kept by a special holder at one of the ends of the housing. The opposite end of the housing is placed on the eyelid so that the falling ball interacts with the cornea through the eyelid. The amount of the ball rebound characteristic of the amount of intraocular pressure, is registered either with the aid of a scale or by a special measuring instrument.

Abstract: A device for restoration of visual functions in cases of affected optic nerve and retina comprises an electromagnetic field radiator emitting the latter field into the region of the eyeball and an electromagnetic field receiver adapted to interact with the radiator, both of them exerting an electrostimulation effect on the optic nerve and the retina. The electromagnetic field radiator is essentially a source of a pulsed magnetic field and is shaped as an electromagnet provided with an adjuster of a distance between the end of the electromagnet and the electromagnetic field receiver, which is in effect an inductor having lead wires furnished with electrodes whose active surface exceeds 10 mm.sup.2.

Abstract: A method for treatment of diseases of the optic tract resides in applying a rotating magnetic field, which rotates at a variable angular velocity and its rotation is brought in synchronism with the blood flow pulsation in the internal carotid artery, is applied to the bridge of the nose, to the upper portion of the orbit of both eyes, to the temporal areas, to both of the auriculo-temporal regions, and to the region of a projection of the visual analyzers.A device for treatment of diseases of the optic tract, comprising a housing, accommodating a drive and a main permanent magnet whose axle is connected to the shaft of a drive through an elastic element. Besides, a magnetic brake is accommodated in the housing in the zone of action of the magnetic field.

Abstract: A method for treatment of diseases of the optic tract resides in a rotating magnetic field, which rotates at a variable angular velocity and its rotation is brought in synchronism with the blood flow pulsation in the internal carotid artery, is applied to the bridge of the nose, to the upper portion of the orbit of both eyes, to the temporal areas, to both of the auriculo-temporal regions, and to the region of a projection of the visual analyzers.A device for treatment of diseases of the optic tract, comprising a housing, accommodating a drive and a main permanent magnet whose axle is connected to the shaft of a drive through an elastic element. Besides, a magnetic brake is accommodated in the housing in the zone of action of the magnetic field.

Abstract: A method of preparing a mixture of ribonucleotides consisting in hydrolysis f yeast nucleic acid with pancreatic ribonuclease at a pH 4.5-5.5. Thereafter, separating the ribonucleotide fraction from the obtained hydrolyzate is effective on membranes with pores sized 50-150 .ANG. with subsequent purification and isolation of the end product.

Abstract: The invention is a method for diagnosis of early stage of optic nerve blood supply disturbance resides in that the state and localization of the optic nerve is determined by virtue of ultrasonic scanning, then a distance from the eyelid anterior surface of the ciliary arteries supplying said optic nerve is measured, whereupon the state of hemodynamics in said ciliary arteries is determined on the thus-measured distance with the aid of ultrasonic pulse-dopplerography, by measuring the linear and volumetric blood flow velocities in said arteries, a value of said linear blood flow velocity below 9 cm/s and of said volumetric blood flow below 5 ml/min are indicative of an early stage of optic nerve blood supply disturbance.

Abstract: The device for fixing a donor's eyeball comprises a body and retainers for holding the donor's eyeball to a support. The body is built up of an inner and an outer portions coaxially fitted one in the other with a possibility of rotating with respect to each other and of being held in a preset position. The retainers are made as a number of arcuate elements secured symmetrically with their one end on the inner body portion, and with the other end, on the outer body portion so as to interact with the donor's eyeball in a preset mutual arrangement of said body portions.

Abstract: A process for producing a collagen-based cross-linked biopolymer is provided in which a collagen solution free of low-molecular impurities is saturated with nitrogen protoxide, its concentration is brought to maximum 80 mass percent and the solution is exposed to an ionizing radiation in a dose of 0.5 to 15 kGy. An implant for hermetization of corneal and scleral wounds involved in eye injuries prepared from said bipolymer has the shape and size that provide for complete hermetization of said wounds. The method for its preparation comprises saturation of a collagen solution free of impurities and having a concentration of 0.2 to 1.3 mass percent, with nitrous oxide, filling of a mould with said solution and its exposure to an ionizing radiation in a dose of 0.5 to 15 kGy. The resultant blank is dried to a moisture content in its biopolymer of 30 to 50 mass percent, whereupon the blank is given the shape and size of a required implant.

Abstract: The device comprises optically interconnected components such as an ultraviolet pulsed laser operating at a wavelength of 223 nm, a uniform light beam former, a slotted mask with its rotation drive, and a means for forming the image of the slotted mask on a surface of the cornea of the eye. The slotted mask having at least two slots shaped as identical lobes provides in rotation for uniform axysymmetric distribution of ultraviolet radiation over the exposed surface of the cornea. Arranged at the optical outlet of the former are a unit used to monitor energy density of ultraviolet radiation and a microscope.

Abstract: The surgical correction is carried out with the aid of thermocoagulation of the cornea along the lines appropriately oriented with respect to the minimum refractive power meridian and to the distal points of the eyeball central optic zone. Two of such lines are essentially circular arcs, while two other lines are the sides of two angles the bisector of which is the minimum refractive power meridian. Provision is also made for a device for preliminary marking out of the eyeball, aimed at carrying out thermocoagulation along said lines. The device is in fact a cylinder-shaped housing which accommodates special elements adapted to be brought in contact with the corneal surface upon placing the housing on said surface in order to obtain the impressions of the lines along which thermocoagulation is then carried out.

Abstract: A device for ophthalmologic operations comprised of a holder (1), a cutting nstrument (9) provided with a catch (10) and secured on a spring-loaded rod (7) accommodated inside of the holder (1) and having a micrometric thread (11) on the other end. Mounted on the holder (1) by means of a micrometric thread (15) is a thrust bushing (14) which carries the catch which fixes the position of this bushing (14) and is interconnected with a nut by which the rod (2) is moved.

Abstract: A posterior-chamber intraocular prosthetic lens includes an optical lens (1) and two diametrically opposite supporting elements (2), each of the supporting elements (2) being shaped as a curvilinear body one of its lateral surfaces being convex and facing with its convex portion (3) in a direction opposite to the lens principal plane, while the other lateral surface of the body is cancave and faces with its concave portion (4) toward the lens (1) principal plane; the ends of the supporting elements (2) are rounded off and face each other, while the supporting elements (2) are spatially turned away from each other with respect to the principal plane of the optical lens.