RU2475209C1 - Intraocular lens - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention refers to medicine and medical equipment, namely to surgical ophthalmology. An IOL comprises an optical portion and a support portion. A front surface of the optical portion comprises a convex parabolic surface, while a back surface of the optical portion represents a surface of an aspheric Schmidt plate reflected with respect to a plane drawn through inflection points of the aspheric Schmidt plate and perpendicular to an IOL symmetry axis. A concavity of the back surface of the optical portion in the centre of the optical portion faces the front surface of the optical portion, while the symmetry axis of the front surface of the optical portion matches with the centre of symmetry of the back surface. The support portion represents a flat ellipse with the diametric segments on a greater axis of the ellipse comprising through X-cuts.

EFFECT: use of the presented design enables compensating and reducing spherical aberration, enlarging visual field and providing multifocality.

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Description

The invention relates to the field of ophthalmic surgery.

Known artificial lens of the eye (IHG) according to the patent of Russian Federation No. 2134086, containing the optical part in the form of a positive lens and a supporting part.

However, this IHG has significant drawbacks: the presence of spherical aberration, distorting the quality of the optical image and not wide enough field of view.

The technical result of the invention is the reduction of spherical aberration, the expansion of the field of view and the creation of a multifocal lens of the eye.

The technical result is achieved by the fact that in the artificial lens of the eye containing the optical and supporting part, the front surface of the optical part is made in the form of a convex parabolic surface, and the rear surface of the optical part is made in the form of the surface of an aspherical Schmidt plate mirrored symmetrical relative to the plane drawn through the points the inflection of the aspherical Schmidt plate and the perpendicular axis of symmetry of the IHG, while the rear surface of the optical part is turned concave, laid in the Central zone of the optical part, towards the front surface of the optical part, and the axis of symmetry of the front surface of the optical part coincides with the center of symmetry of the rear surface, while the supporting part is made in the form of a flat ellipse, and through cross-shaped cross-sections are made on diametrically opposite sections on the major axis of the ellipse cut through.

The invention is illustrated figure 1-2.

Figure 1 - frontal projection IHG.

Figure 2 is a top view of the IHG.

The proposed IHG is made as follows. IHG contains the reference 1 and the optical part 2. The front surface 3 (Fig.1) of the optical part 2 is made in the form of a convex parabolic surface. The rear surface 4 of the optical part 2 is made in the form of an aspherical Schmidt plate facing the curved side to the side opposite to the front surface 3 of the optical part 2.

Schmidt aspherical plate has a round shape. The axis of symmetry 5 of the parabolic surface 3 is aligned with the axis of symmetry of the aspherical Schmidt plate.

The supporting part of the IHG is made in the form of a flat ellipse 6. On diametrically opposite sections on the major axis of the ellipse, through cross-shaped slots 7 are made (Figure 2).

The rear surface 4 of the optical part 2 is made in the form of the surface of an aspherical Schmidt plate, mirrored relative to the plane 8 (Figure 1), drawn through the inflection points of the aspherical Schmidt plate, perpendicular to the axis of symmetry 5. In this case, the rear surface 4 of the optical part 2 is facing with a concavity located in the central zone of the optical part, toward the front surface of the optical part, and the axis of symmetry of the front surface of the optical part coincides with the axis of symmetry of the rear surface.

The proposed IHG works as follows. Light rays, having passed the front surface 3, fall on the rear surface 4 of the optical part 2.

The combination of the front surface 3 in the form of a parabolic surface and the rear surface 4 in the form of an aspherical Schmidt plate can compensate for spherical aberration and expand the field of view.

Using the proposed design will compensate and reduce spherical aberration, expand the field of view, develop a multifocal design and expand the arsenal of applied IHG.

Claims (1)

An artificial lens of the eye (IHG) containing the optical and supporting parts, characterized in that the front surface of the optical part is made in the form of a convex parabolic surface, and the rear surface of the optical part is made in the form of the surface of an aspherical Schmidt plate mirrored symmetrical relative to the plane drawn through the points the inflection of the aspherical Schmidt plate and the perpendicular axis of symmetry of the IHG, while the rear surface of the optical part is facing with a concavity located in the center Flax zone of the optical portion towards the front surface of the optical part and the axis of symmetry of the front surface of the optical part coincides with the center of the rear surface of symmetry, wherein the supporting portion is formed as a flat ellipse, wherein at diametrically opposite portions on the major axis formed through cross-slits.

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