IL102207A - Optical visual system - Google Patents

Description

102207/6 B A C K G R O U N D O F T H E I N V E N T I O N .

This patent application relates to the area of medical technique and specifically to visual device . which form on the retina not less than two images simultaniously. for visually handicapped patients.

There is a significant percentage of people, who have no yellow spot in their eyes or their yellow spot is not developed sufficiently. The yellow spot presents a place of the best vision in an eye and. therefore, these people have very weak eyes. It is impossible to provide them with spectacles, which enable these people to drive a car. There are other eyes' diseases, which have the like influence on visual ability of the people. Besides, people with a usual sight ability sometimes must perform works, which require very high visual ability, it can be executed by special means, for example, binoculars.

However binoculars have usually high weight and size, they limit an user mobility, they require mechanical focusing of a picture. Besides, they decrease the field of view and do not allow to see foreground and background at the same time.

Therefore, it is an urgent problem to develop an optical system, which can provide a good vision ability to the visually handicapped people and. on the other hand, permit to people with normal vision to do different precision works without application of bulky optical instruments and without significant limitations of time.

S U M M A R Y O F T H E I N V E N T I O N .

This patent application is based on the Galilean telescope as a part of the visual system, when one lens is negative and another - is positive. The focal points are found to be outside the interval between these lenses and practically coincide. In the invention the second lens has such shape, that the distance between this lens and the focus point is equal or less, than its focus length.

The first lens may be situated before the eye. on the eye surface and inside the eye and is controlled by it. The central axis of a telescope does not coincide with the axis of vision, passed through the center of the pupil and the eye center.

The second lens may be situated motionless before the eye or may be connected with the first lens so, that its center is situated on one axis with the center of the first lens. The second lens consisting of optical on or more parts, which are or the telescope's objective or spectacle lens, with different optical powers or magnifying glass. The first lens consists of the external and central parts. Each part consists of one or more external and central optical zones, with different optical powers. 102207/6 The distance from the zones of the central part of the first lens to the focus point is equal or more, than the focal length of the central part zones. The external part of the first lens serves for the correction of the lateral vision of a specific man. The central part of the first lens is the part of the Galilean telescope.

The invention allows to receive the magnification of the image on a part of the •retina and to increase the image sharpness without magnification of the image on another part of the retina. Image received from the telescope suppresses the image received from the external part of the first lens on the general part of the retina.

B R I E F D E S C R I P T I O N O F D R A W I N G S .

Fig. 1. demonstrates the version of the optical system operation, when there are two directions of the eye ball and the second lens is motionless. / 5, 6. 1331 Fig. 2 demonstrates the version of the arrangement of the optical system lenses in respect to their common focus.

Fig. 3 demonstrates an optical visual system wherein the first lens is situated inside an eye and second lens encased in a spectacles' rim.

Fig. 4 demonstrates an optical visual system wherein the first lens is situated inside an eye and second lens is a contact lens, which is situated immediately on the eye surface.

Fig. 5 demonstrates an optical visual system wherein the second lens is combined coaxially with the first lens and is situated before the eye.

Fig. 6 demonstrates an optical visual system wherein the second lens is combined coaxially with the first lens and is situated immediately on the eye surface.

Fig. 7 demonstrates an optical visual system wherein the second lens is combined coaxially with the first lens and is situated inside the eye.

Fig. 8 demonstrates the misalignment of the first lens and the pupil.

Fig. 9 demonstrates the invariable optical filter on the external part of the first lens.

Fig. 10 demonstrates the variable filter, part of which is situated on the external part of the first lens and another part is situated on the second lens. 102207/6 D E T A I L E D D E S C R I P T I O N O F D R A W I N G S .

As was noted above, most broadly, the optical visual system includes a contact lens, such as illustrated in Fig. 1. Referring to Fig.l the visual optical system provides a significant field of view, owing to the mobility of the first lens (1). situated on the eye surface (2). when a central zone (4) of this lens (1) operates together with the part of the second Iens(3) and the external part of the first lens serves for the lateral vision.

Fig. 2 demonstrates operation of the part of the optical system, consisting of the part of the second lens (3) and the central zone (4) of the first lens (1). which have the common focus point in the one point. F. The distance from the second lens (3). which is spherical to the focus point F is less or equal, than the focus length of the this lens f Ί.

The distance from the central zone of the first lens in case the zone of lens is spherical to the focus point F more or equal, than the focus length of this lens f2.

In the formulae for the calculation of ¾ and ¾ are designated: n - the index of the lens refraction; ¾ - the refraction index of a fluid at the eye surface; di; d2 - the lens thickness; Ϊ2 - the central zone curvature radius of the first lens; Ri - the curvature radius of the part of the second lens; Pi - Main optical planes of the part of the second lens; ?2 - Main optical planes of central zone of first lens. 102207/4 The advantage of the invention is the availability of zones, thereby permitting a person to have some orientation for fulfilling simple operations even without spectacle lens.

Comparatively with previous systems the system according this preferred embodiment increases the field of view.

The availability of zones allows to use more powerful lenses and as a result leads to increase of magnification.

Fig. 3 demonstrates an optical visual system wherein the first lens (1) is situated inside the eye (2) and second lens (3) is encased in a spectacles' rim.

Fig. 4 demonstrates an optical visual system wherein the first lens is situated inside an eye and the second lens is a contact lens, which is situated immediately on the eye surface, what allows to achieve a better cosmetic appearance.

Fig. 5 demonstrates an optical visual system wherein the second lens is combined coaxially with the central part of the first lens and is situated before the eye. which is suitable for persons, which can not use contact and intraocular lenses.

Fig. 6 demonstrates an optical visual system wherein the second lens is combined coaxially with the central part of the first lens and is situated immediately on the eye surface.

Fig. 7 demonstrates an optical visual system wherein the second lens is combined coaxially with the central part of the first lens and is situated inside the eye.

The embodiments showed in the Fig. 6 and 7 allows to achieve for the visually handicapped people a vision comparable to people with normal vision.

Fig. 8 demonstrates the pupil of an eye (5). the central part(6) of the first lens and the external part (7) of the first lens. The center of the first lens is not on the optical axis of an eye which is going through the center of the pupil.

Fig. 9 demonstrates the optical system external part of the first lens of which includes the optical filter (8) absorbing some amount of light which is necessary to decrease the diameter of the central part of the first lens and to increase the area of the external part of the first lens.

Fig. 10 demonstrates the optical system external part of the first lens of which includes the optical filter (9), the second lens also includes the optical filter (10). These filters form the variable filter and are intended to decrease the diameter of the central part of the first lens as well as to control the light flux when the illumination is changed.

Claims (1)

1. 02207/4 102207/2 11. The optical visual system as claimed in one of the Claims 1-9. wherein the external zones of the said first lens and the said second lens include optical filters forming a variable optical filter. 12. An optical visual system as claimed in Claim 1, 2 and 6, wherein lenses are composite. 13. An optical visual system substantially as herein before described in Fig. 1,2. 14. An optical visual system substantially as herein before described in Fig. 3-8. 15. An optical visual system substantially as herein before described in Fig.9.10.