RU2364376C1 - Intraocular lens - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention concerns medicine, and specifically ophthalmosurgery. An intraocular lens (IOL) an optical and support part. The centre of front surface the optical part represents a segment of surface derived from rotation of 4^th order Cartesian oval around the symmetry axis aligned with the IOL optical axis. The periphery of front surface of the optical part is shaped as executed in the form of a segment of ellipsoidal surfaces. The optical centre of the front surface is aligned with the IOL symmetry centre. The back surface of the optical part is flat. The support part comprises a flat disk.

EFFECT: invention provides reduction of IOL-eye system through spherical aberration.

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Description

The invention relates to medicine, and more particularly to ophthalmic surgery.

Known artificial lens of the eye (IHG) with a metered change in optical power by AS No. 1697788 with priority of 12/26/1986, containing the optical part and diametrically located symmetrical closed support elements in the form of curved shapes. The supporting elements have a hinge of the first kind in the plane of symmetry passing through the center of symmetry of the optical part.

However, this IHG has a significant drawback: the presence of spherical aberration, this design also does not have multifocality and does not reduce aberration in the IHG-eye system.

The technical result of the invention is the reduction of aberration in the IHG-eye system, the creation of multifocal IHG while expanding the arsenal of IHG.

The specified technical result is achieved by the fact that in the artificial lens of the eye containing the optical and supporting part, the central part of the front surface of the optical part is made in the form of a surface segment obtained by rotating a Cartesian oval of the 4th order around the axis of symmetry, combined with the optical axis of the ICH, while the peripheral part of the front surface of the optical part is made in the form of a segment of an ellipsoidal surface, and the optical center of the front surface is aligned with the center of symmetry of the ICH; the rear surface of the optical part is made flat, the supporting part is made in the form of a flat disk.

The proposed set of essential distinguishing features is necessary and sufficient for the unique achievement of the claimed technical result.

The invention is illustrated Fig.1-3.

Figure 1 - frontal section of the IHG.

Figure 2 is a side view along arrow A.

Figure 3 - the course of the optical rays.

The artificial lens of the eye (IHG) contains the optical 1 and the supporting part 2 (figure 1). The central part 1 of the front surface of the optical part (Fig. 1) is made in the form of a segment of the surface obtained by rotation of the Cartesian oval of the 4th order.

The Cartesian oval is a curve symmetrical about the X axis of the Cartesian coordinate system. The Cartesian oval is a curve of such a form in which the refracting optical surface obtained from its rotation relative to the axis of symmetry is anaberrational when the light rays from a point source located at a given point on the optical axis are collected at one point with the rays passing through remote from the axis parts of the surface and, as a result, the optical image of the point is not a spot, as in the presence of aberrations, but a point.

Surface 1 is formed by rotation around axis 3, which is its axis of symmetry. Axis 3 is combined with the optical axis of the IHG.

The peripheral part of the front surface is made in the form of a segment of an ellipsoidal surface. The optical center of the front surface is aligned with the center of symmetry 5 ICH. The rear surface of the optical part 6 is made flat. The supporting part 2 is made in the form of a flat disk 7.

The proposed IHG works as follows. Light rays, (Fig. 3) pass through surface 1 and form an aberrationless stigmatic image at the point of first focus 8. Light rays passing through surface 4 form an image at the point of second focus 9. Thus, a two-focal multifocal system with reduced spherical aberration is created .

Implantation of IHG is as follows. After phacoemulsification, the anterior chamber and capsule bag are filled with viscoelastic. IHG is inserted into the injector cartridge or folded with tweezers so that the additional optical element is outside the bend. Through a tunnel incision using an injector or when folded, the IHG is introduced into the anterior chamber, a capsule bag. After implantation, an additional optical element is located on the side of the IHG, facing the cornea. The front chamber, capsule bag is washed with a BSS solution, then 0.01% Acetylcholine solution is introduced. Next, sealing the operational access.

Using the invention allows to achieve a technical result - reducing aberration in the system of IHG-eyes, creating a multifocal IHG while expanding the arsenal of IHG.

Claims (1)

An artificial lens of the eye (IHG), containing the optical and supporting parts, characterized in that the central part of the front surface of the optical part is made in the form of a segment of the surface obtained by rotating the Cartesian oval of the 4th order around the axis of symmetry, combined with the optical axis of the IHG, while peripheral part of the front surface of the optical part is made in the form of a segment of an ellipsoidal surface, the optical center of the front surface being aligned with the center of symmetry of the ICH; the rear surface of the optical part is made flat, the supporting part is made in the form of a flat disk.

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