DE1772252A1 - Bifocal contact lenses - Google Patents

Description

^^ 8 MUNICH

DB. ING. F. "WUE STHOFF ■" == * === - ^ - gjCHWEieEBSTBASSB S

DIPL. ING. G.

TELEPHONE 22 ΟβSt DB .E. ν. PBCHMANN

TSX, BGBAKJCADBE PATENTANWÄLTE PBOTJ0CM »AT * NT

■ 1A-34 256

description to the patent application

THE PLASTIC CONTACT LENS COMPANY 18 South Michigan, Chicago, Illinois, USA

concerning
Bifocal contact lenses

The invention relates to contact lenses with bifocal properties

Bifocal contact lenses were made before. Such lenses generally correspond to the bifocal lenses used in conventional eyeglasses, in which a more or less pronounced boundary line is provided is. The wearer of such lenses must see through part of the lens in order to see into the perne can and through another part of the lens to see nearby creates

■ - 2 00988 7/0073

1A-34 256 - 2 -

With the usual glasses, the eye of the Adjust the wearer in general to the bifocal lens »without any particular difficulty. Generally the wearer looks straight through an upper part of the lens to see into the distance and lowers his eye to look through the lower part of the To be able to see lens if he wants to see sharply nearby

Bifocal contact lenses have been designed so that they can be used in essentially the same way. Am a much more difficult problem, however, is to accustom the wearer to having his eye on distance and sight adjusts. Since the lens sits directly on the eye, this obviously has very little leeway to eioh adjust so that one part of the lens is opposite the other is preferred. If the lens is in its position on the eye slipped, an additional adjustment of the wearer is also necessary, which still prevents the use of the contact lenses further complicated

It is an object of the invention to provide a contact lens, which has bifocal properties, but those that occur when using the previous bifocal contact lenses Avoids difficulties as much as possible.

Another object of the invention is to provide a

0QR8 8X / 0p7 3 _ 3 "

BATH ORIGINAL

1A-34 256

to provide bifocal lens of the type described, which can be manufactured and fitted without undue difficulty, so that the lenses are relatively inexpensive can be purchased »

The invention is also directed to contact lenses of the type described, which can easily be manufactured as cosmetic lenses ”, the like

Some special embodiments of the lenses according to the invention are shown in the drawing »

Fig. 1 is a cross section of the lens of the invention} Pig, 2 shows the lens according to Eig. 1 in Oracle looks;

Figures 3 to 10 illustrate various embodiments for the pupil areas of lenses according to the invention. j

The lens according to the invention can be designed in the usual way, for example it can correspond to the type described in US Pat. No. 2,510,438 ^. Such lenses are designed as so-called ororneal lenses M (cornea) and have a pupil area and around it an iris area. However, the invention is not limited to lenses of the corneal type,

009887/0073 -, 4- -

BAD ORlGINAt

but is also applicable to other contact lenses

The lenses according to the invention differ from the heretofore common in that the area surrounding the pupil area of the lens and, in some cases, parts thereof this pupil area includes regions that are substantially opaque. The pupil area is of course the area which directs the incident light directly onto the optic nerve, and in the case of the invention This pupil opening is preferably practically completely transparent to lenses. This see-through area is that part of the lens that provides the main part of the view, and a correction necessary for distance vision can be made either in this area when the lens is manufactured or over the entire lens. The lens according to the invention can also be undercorrected and nevertheless grant a sufficient view. Also a pronounced bifocal correction in the area that surrounds the pupil, is provided.

The area surrounding the pupil comprises a plurality of substantially opaque regions separated from one another. The viewing tube casual spaces between these opaque parts serve to expand the peripheral field of vision and also mediate a good haze. read showed that these gaps

009887/0073

% BAD

ΊΑ-34 256

for this purpose are extremely effective even without any optical correction in this area of the lens.

The type of lens 10 shown in Hg. 1 and 2 consists of a pupil area 12 and an iris area 14 »which surrounds the pupil area * according to the invention the iris area 14 formed by opaque sectors 15 and see-through areas 16 that let the light through. In the embodiment shown, the see-through areas are 16 Slots

When using the lens shown in FIGS will the. Contact lens placed on the wearer's eye in the usual way. Since the area 12 of the lens over the When the pupil comes to rest, light falls into the eye. A corresponding correction for shortness of sight can be made in this area the lens can be provided without difficulty. Surprisingly, they convey through the opaque sectors separate viewing areas 16 view · This can be done without a prescribed optical correction in this area

f "■

the lens can be achieved, however, is usually one too The entire lens is provided with a base to allow for a long distance vision. !

The lenses according to the invention can irrigation line 14

009887/0073 "' ⁶ "

^Onfö'NAL INSPECTED

1A-34 256

of different colors. This achieves a desired cosmetic effect and the Color-induced opaque or semi-opaque properties mean that the light only passes through the see-through areas can penetrate. The coloring of the pupil and iris area can be done in the usual way, 25.B. so that you can while dyes are introduced into the lens during manufacture or by painting the lens with opaque colors

If the doctor prescribes bifocal lenses, he must Of course, the eyesight of the respective patient is taken into account draw. These capabilities are vastly different, and a lens designed for a patient can work for one not be suitable for others. The lenses according to the invention can therefore be designed in the most varied of ways.

Thus, for example, in special cases the pass-through areas 18 shown in FIG. 5 can provide the best view. Figures 4, 5, 8 and 9 illustrate embodiments in which slots are used in a variety of configurations. The slots 20 of Figure 4 provide; parallel-Durchsichtbersiehe in the otherwise opaque Irisbereioh ■. In Fig. 5, the slots 22 are connected together in a rectangular configuration. In Fig. 8 and 9, the slots 24 and 25 are arranged crosswise. Self* ; understandable can be other arrangements for the narrow soles

009887/0073 - 7 -

ORIGINAL INSPECTED

1A-34 256

be chosen and the specialist will be the best in each case Determine the arrangement by studying the properties of the eye. It should be noted, however, that the best design of the lens is automatically determined by that with the help of appropriate facilities, the impact different configurations to suit the patient's eye educated",

In the arrangement shown in Fig. 6 is about the A number of pinholes 26 distributed in the iris region. In FIG. 7, they extend from the central see-through region curved slots 30 outwards "

A further arrangement suitable for certain cases is shown in FIG. A pair of concentric circular see-through areas 34 are provided here. Such embodiments with curved slits can either have closed circles, as in FIG. 1.0, or a number of individual curved slits can be distributed over the iris region _e

Adjusting the lenses leads to wide fluctuations in dimension and pattern. For example, some contact lenses are 9.5 to 12 mm in diameter. The pupil area has a diameter of about 2 to 7 mm in most lenses and the extension goes without saying

009887/0073. - 8th -

1A-34 256

of the see-through areas described above limited by the extent of the iris area. When it comes to slots is, its width is best kept between 0.5 and 1.5 mm, although Ausrühtmgsformen also come in embossing the slots are only 0.05 mm wide or even narrower

As an example, a lens is given, which in its W embodiment of fig. 8 corresponds. The diameter of the pupil diameter is 3.0 mm, the slits are 0.8 mm wide and the total diameter is 12 mm.

The simplicity of the embodiments according to the invention compared to the usual bifocal lenses is readily apparent. The technology used in the manufacture of cosmetic lenses can be readily used in manufacture adjust the bifocal lenses according to the invention. The lenses do not require any special training on the part of the wearer as he does not has to "hunt" for bifocal segments when he changes from far vision to distant vision or vice versa. The head remains in the natural position for reading. The design of the lenses can suit the eyesight of the person concerned Be adapted to the carrier. It is also important that the lenses have a natural appearance, since they can be used without difficulty can be colored. A wide variety of eye colors can be selected where this is desired for cosmetic reasons will·

0 0 988 7/0073 - 9 -

1A-34 256

An additional great advantage of the lenses according to the invention is that they fit very well. The so far common lenses, especially the bifocal lenses, are in In many cases it is extremely difficult to carry, as sucking on the eye is avoided in the interests of good vision got to. Is has proven itself in testing the inventive Lenses shown to be a correct fit far from being so Great demands have to be made, as with the usual bifocal lenses.

As for the pupil area, so can here too Opaque areas exist, but form translucent ones See-through areas, optionally in the form of slits, the main portion of the pupil area.

The invention also offers certain advantages in the design and manufacture of the bifocal lenses. In lenses with high optical plus or minus values, a lower strength can be chosen, so that the position determined by the depth of focus can be reduced Dloke ₀ One can also grind a torisohen cylinder obgleioh the cylinder can cause a residual portion astigmatism. This can be avoided with such a construction jedpoh when applying the cosmetic Bifokaltechnik described. It should be noted that the illustrated training

- 10 009887/0073

- 10 -

guide forms are to be understood as examples only, i.e. that the number and shape of the slots and the

the relationship between the transparent and opaque areas of the lenses can be largely modified »

Claims

8650

009887/0073

BAD ORfQiNAl *

Claims (6)

λ λ 8 MÜNCHEN Ö0 / \ f \ SCHWEIGEHSTHÄSSE 8 * TjetBFow sa οβ ei 177225? PSOTXOTPATBHT 1A-34256 claims 1. Bifocal contact lens, consisting of an iris area and a pupil area, characterized in that the iris area is predominantly opaque and at least the main part the pupil area is translucent and several see-through areas are provided in the iris area, wherein the pupil area is optically designed in such a way that it corrects the distance vision of the wearer and wherein the Combination of the pupil and iris area produces a bifocal effect for the Vrager " 2β contact lens according to claim 1, characterized in that the iris area is a natural Eye color is colored accordingly 3. Contact lens according to claim 1 or 2, characterized in that g e t that the see-through areas represent long slits. 4 «Contact lens according to claim 1 to 3, characterized in that it is e η η ζ e i c h η e t that the see-through areas cross, " 009887/0073 - 2 - BATH ORIGINAL ■■■ is, · .. ·. ";. ■ '■"■' Siiliiiiii : ^! ".:! -Ϋϊϋίΐιί: ϊ: ί. ;; !!,. Ιι;!: Ϊΐμίίίΐί ^ ..:,. ■ -Jt- 4L 1i 772252 5 · Contact lens according to claim 1 to 3 _t characterized in that the calibration Durehsichtbereiohe from the pupil region aue radially outwardly eretreokene 6. Contact lens according to claim 1 or 2, characterized in that that the Durehsichtbereiohe several needle-fine spaced apart Represent holes. 7 · Contact lens according to claim 1 or 2, characterized in that the Durohichtbereiohe several represent slits arranged at a distance from the pupil area θ. Contact lens according to claim 1 or 2, characterized in that the see-through regions represent one or more curved slits 9 · Contact lens according to claim 8, characterized in that the durable areas are coneentric are arranged ⁸⁶⁵⁰ 009887/0073 ORIGINAL INSPECTED