The present invention generally relates to telescopic, or magnifying, spectacles and more partic- ularly is directed to an adjustable magnifying spec¬ tacle for use by individuals having severely impaired vision or having implanted intraocular lenses.

Implantation of intraocular lenses, for example, cataract lenses, has now become commonplace. Many types of intraocular lenses are utilized which are implanted into the eye of an individual and consist of an optic lens and haptic for fixing of the intraocular lens in an anterior chamber or a posterior chamber of the eye. Many of these intraocular lenses are of a single focal length, and it is therefore necessary for the user to utilize spectacles or the like in order to enable the individual to correct his vision for a range outside of the fixed-focus implanted intraocular lens.

In the event that, after a lens is implanted, the patient's vision continues to change, the magnifica¬ tion required may be greater than can be supplied by spectacles having a single objective lens therein. Consequently, changes or variations in the individ¬ ual's vision must be accommodated by a refitting of glasses or the like, which is both time-consuming and expensive.

Thus, because of the unique problems surrounding the individual with implanted lenses, proper correc¬ tion to obtain improved visual acuity of the individu¬ al is difficult. Because of the fixed focal length of the implanted intraocular lens, problems are encoun¬ tered in switching from various viewing situations,

such as reading to, for example, the watching of television. In most instances, the design of a single objective lens assembly mounted in a conventional spectacle frame is unable to provide proper improved vision for various viewing situations.

SUMMARY OF THE INVENTION

The present invention generally includes a lens and a spectacle which together form the Galilean telescope system for magnifying images to aid the vision of the impaired individual in order to increase the eye's resolving ability. As may be used herein¬ after, this system may be considered a teledioptric system.

Generally, a spectacle, or teledioptric, system, in accordance with the present invention for individu¬ als having at least one implanted intraocular lens includes an objective lens means for forming an image of a distant object on the implanted intraocular lens. A spectacle frame is provided for supporting the objective lens means on an individual relationship with the implanted intraocular lens.

Means are provided for causing non-rotational and translational movement of the objective lens along an optic axis defined by the objective lens means and the implanted intraocular lens in order to adjust the vertex distance between the objective lens means and the implanted intraocular lens. The adjustability of the vertex distance is crucial to the clarity of the image. Importantly, the translational movement of the objective lens means maintains any astigmatic correc- tion which is not possible if the lens is rotated as typically occurs in conventional telescopic systems.

More particularly, the spectacle system, in accordance with the present invention, may include a lens blank and a lens holder means for supporting the objective lens means with the lens holder means being slidably mounted within the lens blank and the lens blank being fixedly attached to the spectacle frame means.

In one embodiment of the present invention, the lens blank may be hinge mounted to a spectacle frame for enabling rotation thereof out of the intraocular lens line of sight. This feature enables the rapid change of telescopic or magnification correction to enable the user to quickly shift from a viewing position, such as watching television, to another viewing position, such as reading.

In another embodiment of the present invention, means may be provided for removably attaching an objective lens means to the spectacle frame means. This enables the user to utilize a preset lens system having a selected vertex distance to be easily at¬ tached to the spectacles when reading is desired or under other specific circumstances.

More particularly, the means for causing non- rotational and translational movement of the objective lens means may include a movable driver disposed in a slot in the lens blank and means defining an L-shaped slot in the lens holder means for accepting the driver upon assembly of the lens holder means in the lens blank, in which the driver is disposed within the L portion of the L-shaped slot. The driver may have a threaded hole therein for engagement with a screw actuator, with the driver and the screw actuator being mounted in a housing attached to the lens blank. In

order to provide manual control of the driver posi¬ tion, a coaxial wheel attached to the screw actuator protrudes, in part, from the housing for enabling manual rotation thereof.

For individuals having two implanted intraocular lenses, the spectacle system, according to the present invention, includes two lens systems, one for each eye of the individual, which are independently adjustable for accommodating and adjusting the vertex distance between each lens system and the associated implanted intraocular lens.

A method, in accordance with the present inven- tion, for clarifying visual acuity for individuals having at least one implanted intraocular lens in¬ cludes the steps of disposing an objective lens system in a spaced apart relationship with the implanted intraocular lens and adjusting the vertex distance between the objective lens system and the implanted intraocular lens without rotation of the objective lens system.

BRIEF DESCRIPTION OF THE DRAWINGS

The advantages and features of the present invention will be better understood by the following description when considered in conjunction with the accompanying drawings in which:

Figure 1 is a perspective view of the present invention including a lens system attached to a spectacle frame;

Figure 2 is a schematic diagram of the operation of the lens system in conjunction with an implanted intraocular lens;

Figure 3 is an enlarged perspective view of the lens system of the present invention when assembled;

Figure 4 is an exploded view of the lens system of the present invention; Figure 5 is an alternative embodiment of the present invention; and

Figure 6 is another embodiment of the present invention in which the lens system is hinge-mounted to a spectacle frame to enable rotation thereof out of the line of sight of the individual.

DETAILED DESCRIPTION OF THE DRAWINGS

Turning now to Figure 1, there is shown a spec- tacle system 10 for individuals (not shown) having at least one intraocular lens 14, as represented in Figure 2. The lens may be implanted in any conven¬ tional manner and may be positioned in an anterior chamber of the individual's eye 16 or a posterior chamber of the individual's eye 16.

Generally, the spectacle, or teledioptric, system

10 includes a spectacle frame 20 which provides means for supporting an objective lens system 24 in a spaced apart relationship with the implanted intraocular lens

14, as.shown in Figure 2.

It should be appreciated that while only one objective lens system 24 is shown in the figures, two identical lens systems 24 may be mounted on the frame 20 in a side-by-side relationship for individuals having two implanted intraocular lenses. In addition, the spectacle system 10 in accordance with the present invention may also be suitable for individuals having impaired vision.

The objective lens system 24 provides a means for forming an image of a distant object on the implanted intraocular lens. As shown in Figures 3 and 4, the lens system 24 includes a lens blank 28 formed from a cylindrical member 30 having a circumference and rear perimeter 32 sized for fitting into the spectacle frame 20 in a conventional manner. A lens holder 36 is provided along with snap rings 3840 for supporting lens pieces 44 46. While two lens pieces 44 46 are shown, it should be appreciated that any lens system and combination of lenses may be utilized as may be prescribed for increasing the visual acuity of the individual user including astigmatic correction.

As shown, the lens holder 36 is sized for being slidably mounted in the lens blank 28 and includes an L-shaped slot 50 for enabling engagment with a driver 54 as will be described hereinafter in greater detail.

Upon assembly, a long portion 58 of the slot 50 and a slot 60 in the lens blank 28 enable a depending portion 64 of the driver 54 to align the lens holder 36 with the lens blank 28. After insertion of the lens holder 50 into the lens blank 28, rotation of the lens holder 50 in a counter-clockwise manner enables the driver 54 to engage an L portion 68 of the slot 50.

The driver 54, along with an actuator 72, pro- vides a means for causing non-rotational and transla¬ tional movement of the lens holder 36 along an optical axis 76, as represented by an arrow 78, in order to adjust the vertex distance D, see Figure 2, between the objective lens system 24 and the implanted intra- ocular lens 14.

The driver 54 and actuator 72 are supported by a housing 80 which includes a rear portion 84 and a front portion 86, the latter being attached to the lens blank 28 by screws 90.

The actuator 72 includes a threaded portion 94 for engagement with a threaded hole 96 in the driver 64. As shown in Figure 4, a dowel 100 extends through a hole 101 in the driver 64 when the housing rear 84 and front 86 portions are attached by screws 102 with the actuator 72 and the driver 64 therebetween. Upon assembly, a knurled wheel 106 of the actuator 72 protrudes from the housing 80, as shown in Figure 3, enabling manual rotation thereof in order to move the driver and lens holder in a translational manner.

An alternative spectacle system 120, in accor¬ dance with the present invention, includes a lens blank 122 having clips 124 thereon for attachment to a conventional pair of glasses, not shown.

Another embodiment 126 of the present invention is shown in Figure 6 in which hinges mounting the lens blanks 28 to a frame 132 provide a means for enabling the lens blanks 28 to be rotated out of the intra¬ ocular _, lens line of sight. This is particularly useful for providing the user with a quick adjustment from distant to close viewing.

The spectacle system, or teledioptric 10, in accordance with the present invention, is particularly useful for providing enhanced visual acuity at various focal lengths. For example, the user may adjust the lens holder 36 by way of the wheel 102 to provide clear television viewing and alternatively, when

reading, further adjustment of the lens holder 122 provides comfortable reading vision.

Although there has been hereinabove described teledioptric system in accordance with the present invention, for the purpose of illustrating the manner in which the invention may be used to advantage, it should be appreciated that the invention is not limited thereto. Accordingly, any and all modifica- tions, variations, or equivalent arrangements which may occur to those skilled in the art, should be considered to be within the scope of the present invention as defined in the appended claims.