AU651792B2 - Apparatus and method for cleaning contact lenses - Google Patents

Description

OPI DATE 24/08/90 APPLN. ID 51052 PCT AOJP DATE 27/09/90 PCT NUMBER PCT/US90/00516 INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (51) International Patent Classification 5 (11) International Publication Number: WO 90/08604 B08B 7/00 Al (43) International Publication Date: 9 August 1990 (09.08.90) (21) International Application Number: PCT/US90/00516 (81)Designated States: AT (European patent), AU, BE (Euro.

pean patent), BR, CA, CH (European patent), DE (Eu- (22) International Filing Date: 30 January 1990 (30.01.90) ropean patent), DK (European patent), ES (European patent), FI, FR (European patent), GB (European patent), IT (European patent), JP, KR, LU (European pa- Priority data: tent), NL (European patent), NO, SE (European patent).

305,195 2 February 1989 (02.02.89) US mAR'/ BE .fAI.CA Published (71) Applicant !BECKR'ICH CORPORATION_ US/4lS]; With international search report.

12500 Marion Lane,4202, Minnetonka, MN 55343 Before the expiration of the time limit for amending the claims and to be republished in the event of the receipt of (72) Inventor: BECKRICH, Mary, B. 12500 Marion Lane amendments.

,4202, Minnetonka, MN 55343 (US).

(74) Agents: O'MALLEY, Paul, W. et al.; Kinney Lange, Suite 1500, 625 Fourth Avenue South, Minneapolis, MN 55415 (US).

651792 (54)Title: APPARATUS AND METHOD FOR CLEANING CONTACT LENSES J4~O (57) Abstract

A/

An apparatus (12) for cleaning contact lens (14) includes a cleaning case do having a base (16) and a cover (18) pivotally mounted (24) to the base. The base is provided with two spaced-apart domed lower cleaning pad receptacles (22, 22). Cleaning pads (44, 48) having surfaces (50) spaced-apart handling surfaces (52) are installed on each of the receptacles so that the cleaning surfaces of the up- per pads are facing the cleaning surfaces of the lower pads. The cleaning pads are absorbent and are impregnated with a suitable cleaning fluid. Lenses (14) to be cleaned are placed on the top of each of the lower cleaning pads, the upper cleaning pads are placed on top of the lenses. -30, M r.

6 6 ^4 44 Cz^-^ 169 1 2 WO 90/08604 PCT/US90/00516 1 APPARATUS AND METHOD FOR CLEANING CONTACT LENSES BACKGROUND OF THE INVENTION 1. Field of the Invention.

This invention has relation to the cleaning of contact lenses with a minimum of contact between the lenses and fingers, lens cases, and other possible contaminants.

2. Description of the Prior Art.

Contact lens wearers customarily clean their lenses by procedures which bring their fingers in contact with the lenses. Wearers are urged by purveyors of contact lenses to use either heat or chemical disinfection. Chemical disinfection is recommended over heat by some medical doctors because of the negatives in the heat method: shorter lens life, opportunity to overheat or underheat and the need for a power source. On the other hand, chemical disinfection is effective in low concentration and for a wide variety of organisms. It also needs no power source. See Contact Lens Forum for January 1988, page 76. Liquid surfactant cleaners are recommended for daily use to remove common lens deposits, including bound protein. Ibid, Back Cover. Enzymatic cleaners are recommended for use with surfactant cleaners although surveys show that of soft contact lens wearers never clean with enzymatic cleaners, only 20% clean once a week, and once every two weeks. About 60% of RGP wearers never use enzymes, 5% once a week and 15% once every two weeks. Ibid, page 76. Some enzymatic cleaners can work effectively in as little as fifteen minutes of contact between the cleaner and the lens. Ibid, inside back cover.

WO 90/08604 PCT/US90/00516 2 It is known to place contact lens on scrubbing pads and then to use the index finger on the lens to move the lens around. Ibid, page 46.

Regardless of the currently recommended procedures for the cleaning and other processing of contact lenses, it is believed by the inventor and those in privity with her to be common knowledge that most contact lens users place the lens to be cleaned in the palm, add several drops of cleaning solution to the palm, and then use the forefinger of the other hand on the lens to rub it around in the palm.

Cleaning is completed by inverting the lens and using the finger to rub it around in the palm again. It is recommended that the lens then be picked up on a dome-ended stick and put into an effervescent enzymatic cleaning solution before being reinserted in the eye. Because of the inconvenience of using this stick, this step is often skipped.

What was needed before the present invention was a way of cleaning and otherwise processing contact lenses which eliminated transfer of organisms and materials from the human hand and elsewhere to the lenses during the cleaning process. The inventor and those in privity with her are not aware of any prior art which anticipates this invention and the claims made herein.

SUMMARY OF THE INVENTION An apparatus for cleaning contact lenses includes a pair of cleaning pads for each lens to be cleaned. Each pad is partially defined by a pair of opposed, spaced-apar, roughly parallel, working surfaces, a first of such working surfaces being a cleaning surface and a second of such surfaces being WO 90/08604 PCT/US90100516 3 a handling surface. Each pad is so constituted and constructed that its cleaning surface readily conforms to and comes into intimate contact with one of the opposed side surfaces of a contact lens to be cleaned when the pads are positioned with their cleaning surfaces in facing relation to each other with the lens to be cleaned therebetween, and when pressure toward the lens is applied to the opposed handling surfaces of the pads.

Pressure and movement means is provided to apply pressure to the handling surfaces of the pads in direction toward the lens and to apply relative lateral movement to the handling surfaces of the pads to move the pads laterally with respect to each other when the lens to be cleaned is positioned between the pads.

The cleaning surface portions of both pads are of materials which will not tend to abrade the lens being cleaned. The handling surface portions of each pad have a coefficient of friction with respect to that part of the pressure and moving means in contact with the handling surface portion compared to the coefficient of friction between the pad cleaning surfaces and the lens such that movement of the pads laterally with respect to each other will result primarily in movement of the cleaning surfaces of the pads over the opposed surfaces of the lenses.

In a preferred form of the invention, portions of the pads adjacent the cleaning surfaces are liquid absorbent.

In a preferred form of the invention, at least that portion of the handling surface of at least one of the pads which comes into contact with a WO 90/08604 PCT/US90/00516 4 portion of the pressure and movement means is covered with a releasable pressure sensitive adhesive to tend to prevent relative movement of that pad and the pressure and movement means.

A method of cleaning l.enses includes the first step of positioning each lens to be cleaned between a pair of cleaning pads such as set out above. The lens is to be in contact with central portions of each pad.

A second step of the method is to apply pressure and movement means to central portions of the handling surfaces of each pad in approximate axial alignment with the center of the lens to be cleaned.

A third step is to cause the pressure and movement means to press the pads toward each other and to move the pads with respect to each other radially of the lens and in all directions; but for distances not greater than the largest radius of the lens being cleaned..

In a preferred method, the step of moving the pads with respect to each other in all directions includes moving one of the pads to have its central portion perform a figure of eight movement with respect to the central portion of the other pad.

In another preferred method, the cleaning surface portions of both pads are of materials which will not tend to abrade the lens being cleaned and portions of the pads adjacent the cleaning surfaces are liquid absorbent. Before the step of positioning the lens to be cleaned between a pair of such cleaning pads, the method includes a further step of impregnating the absorbent portion of the pads with an appropriate lens cleaning liquid.

WOP 90/08604 PCT/US90/00516 5 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lens cleaning case forming part of an apparatus for cleaning concave/convex contact lenses; FIG. 2 is an exploded view of the apparatus of FIG. 2; FIG. 3 is an enlarged vertical sectional view taken on the line 3--3 in FIG. 1; FIG. 4 is a vertical sectional view taken on the line 4--4 in FIG. 3; FIG. 5 is a top plan view of an upper motion plate cleaning pad made according to one form of the invention; FIG. 6 is a top plan view of .a lower, base mounted, cleaning pad made according to another form of the invention; FIG. 7 is an enlarged vertical sectional view taken on the line 7--7 in FIG, 6; and FIG. 8 is a top plan view of the lens cleaning case of the present invention showing a cap portion of a boss or stanchion of an upper cleaning pad motion plate and diagramatically indicating the relative horizonal movement of this plate with respect to the cover of the lens cleaning case during the process of cleaning concave/convex contact lenses.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens cleaning case 10, as seen in FIG. 1, is part of an apparatus 12 for cleaning concave/convex contact lenses 14,14. The cleaning case includes a base 16 and a cover 18 pivotally mounted to the base 16 as at 20 in the form of the invention as shown. When the lens cleaning case 10 is in use, a resilient latch 21 on the cover holds the cover WO 90/08604 PC/US90/00516 6 firmly to the base in the form of the invention as shown, and as best seen in FIG. 4.

The base 16 is provided with a pair of rounded, convex or domed lower cleaning pad receptacles 22,22, in the form of the invention as shown. These receptacles 22,22 are fixedly positioned in the base in side by side coplanar relationship with respect to each other.

An upper cleaning pad motion plate 24 includes a pair of rounded, concave or dished, upper cleaning pad receptacles :6,26, in the form of the invention as shown. These upper cleaning pad receptacles 26,26 form an integral part of the upper cleaning pad motion plate 24 and are in side by side, coplanar relation to each other to be in approximately concentric relationship with respect to the lower cleaning pad receptacles 22,22 when the motion plate is installed inside of the cover 18.

The cover 18 is provided with a generally rectangular cleaning pad motion plate movement limiting opening 28, this opening having rounded corners.

Motion plate 24 includes a centrally positioned upwardly extending stanchion or boss extending through the opening 28 in the cover 18.

The motion plate boss 30 is provided with an upper cap portion 32. In the form of the invention as shown, this cap portion is in the form of a generally rectangular cap 34 which is integrally adhered to or otherwise fastened to a cylindrical upper portion of the boss 30 as at 36 after the boss has been extended through the cover opening 28 to thus permanently associate the motion plate 24 with WO 90/08604 PCT/US90/00516 7 the cover 18. It is to be understood, however, that the motion plate 24 need not necessarily be permanently associated with the cover, and that the upper cap portion 32 need only be accessible to the person cleaning the lenses through the opening 28 for manual manipulation of the motion plate.

In the form of the invention as shown, the cap 34 of the upper cap portion 32 of motion plate is provided with a finger receiving upper surface and an upstanding rim 42 around that surface to assist in retaining the finger on the surface 40 for a purpose to be described.

A pair of upper, motion plate cleaning pads 46,46 are provided, each to be assembled with one of the pair of rounded, concave or dished, upper cleaning pad receptacles 26,26; and a pair of lower, base mounted cleaning pads 48,48, each to be assembled with one of the pair of rounded convex or domed, lower cleaning pad receptacles 22,22. Each of the pads 46,46 and 48,48 are partially defined by opposed, spaced-apart, roughly parallel, working surfaces 44,44. A first of these working surfaces of each pad is a cleaning surface 50, and a second of the surfaces is a handling surface 52. The cleaning surfaces 50 of upper pads 46,46 are on the bottom and the cleaning surfaces 50 of the pads 48,48 are on the top so that when the upper pads 46 are assembled to the upper cleaning pad receptacles 26 and the lower cleaning pads 48 are assembled to the lower cleaning pad receptacles 22, the cleaning surfaces 50 will be in facing relationship to each other.

Before the cleaning pads are assembled to the pad receptacles, the pads can have different WO 90/08604 PCT/US90/00516 8 forms. For example, as shown in FIG. 5, either an upper or lower cleaning pad 46 or 48 can initially be stored flat with or :hout slots 54 therein. Where the cleaning pad 46 or 48 is fairly stiff, the presence of slots 54 can help insure that the pad will easily conform to the upper cleaning pid receptacles 26, for example. Where pads of softer materials are used, these slots may not be needed.

In using cleaning pads such as cleaning pad 46 shown in FIG. 5, in either the upper or lower cleaning pad receptacles, the pads may be put into assembled relationship with respect to their pad receptacles using a roughened handling surface 52 and a roughened interior surface of the cleaning pad receptacles 26 or 22; or an adhesive can be placed on the handling surface of the pad or into the receptacle to insure that the pads stay in place during the cleaning operation. Hook and eye fasteners, cylidrical ridges or rims built into the periphery of the cleaning pad receptacles, or any other usual or preferred means of maintaining the pads in place during cleaning can be used.

For example, the pads can initially have an at least slightly domed or dished contour such as seen in FIGS. 2, 3, 4, 6 and 7. This will lessen the problem in maintaining the pads in position in the pad receptacles during the cleaning operation. A further, and preferred, means of maintaining the pads in position is illustrated best in FIG. 7 wherein the handling surface 52 of the pad 48 is covered with a fluid impervious substrate 56, and this substrate can carry a releasable pressure sensitive adhesive 57 thereon. While these pads are being stored before WO 90/08604 PCT/US90/00516 9 they are used, a removable protective skin 58 will cover the adhesive 57 on the substrate 56. In FIG.

7, this skin 58 is shown in t*-e process of being removed from handling surface of the cleaning pad preparatory to use in cleaning a contact lens.

As seen in FIGS. 2, 3 and 4, a resilient means such as a compression coil spring 60 is firmly seated and held on a base compression spring boss 62 and extends upwardly within the base 16 when the cover ?8 is open, and the upper cleaning pad motion plate 24 is clear of the base. When the cover is closed, moving the upper cleaning pad motion plate 24 down to bring the upper cleaning pad receptacles 26,26 into approximate concentric alignment with the lower cleaning pad receptacles 22,22, a tapered downwardly extending motion plate boss 64 moves inside of the upper end of the coil. spring 60 more precisely aligning the cleaning upper pad receptacles 26,26 to be concentric with the lower cleaning pad receptacles 22,22. This spring 60 has the further function of nominally holding the upper cleaning pad motion plate 24 up against the underside of the cover 18 thus insuring that when the cleaning process has been completed, the upper motion plate cleaning pads 46,46 will be spaced from the contact lenses 14,14 so that when the cover 18 is removed, these lenses 14 will remain undisturbed on the center portion of the lower, base mounted cleaning pads 48,48 for easy access to the wearer.

Other resilient means can be used instead of spring 60 within the spirit of the invention and the scope of the claims which follow. For example, a block of sponge rubber or other resilient foam can be WO 90/08604 PCT/US90/00516 10 fastened either to a motion plate boss or to the center part of the base 16; and it will then become the resilient means.

It is well established in the art that liquid be used in performing the cleaning of contact lenses. These liquids can have several purposes including the control of deleterious matter such as dust, protein build-up, bacteria, fungi, yeast and Acanthamoeba, for example. In addition,in the apparatus and method of the present invention, such liquid will serve as a lubricant to reduce the friction between the cleaning pads and the lenses during the use of the apparatus. With the rapid development of contact lenses and the rapid rise of the use of contact lenses, the use of particular liquids on contact lenses made of particular mazerials has not been finally established. This invention is not concerned with the character of the liquids used as long as such liquids do not take the apparatus and method outside of the scope of the claims which follow. Such liquids are characterized herein as any "liquid suitable for cleaning contact lenses" or "suitable cleaning liquid." In order that the contact lenses will not be abraded by the action of the cleaning pads, the pads can be made of any usual or preferred material which will not have an abrading action on the lenses.

Also, preferably, at least the portion of the pad adjacent to the cleaning surface will be made of absorbent material 65; and, except for the pad immediately adjacent the handling surface, it xe preferred that the entire pad be absorbent.

WO 90/08604 PCT/US90/00516 11 The apparatus of the inve-ion, then, includes a suitable cleaning liquid 66 ich has been injected or otherwise permeated into the absorbent portion 65 of the pads 46, 46, 48 and 48 at least in adjacent relationship to the cleaning surface of the pad. This can be done by dipping the pads in an appropriate cleaning fluid 66, by depositing the fluid or liquid directly on the absorbent portions of the pads immediately before use of the pads, by impregnating each pad at its point of manufacture and then hermetically sealing it so that the liquid will still be in place when the sealed enveloped is opened and the pad is situated in its appropriate cleaning pad receptacle, 22 or 26, or by any other usual or preferred method.

In FIG. 7, the suitable cleaning liquid 66 is indicated to have been impregnated into the absorbent portion of the cleaning pad 48 on the right-hand side of the figure, while the left-hand side of that pad is illustrated as being of absorbent material but not yet impregnated with the fluid 66.

LENS CLEANING METHOD AND OPERATION To clean convex/concave contact lenses 14,14, using the form of the invention as shown, the cover 18 of the lens cleaning case 14 is pivoted from the position as seen in FIGS. 1, 3 and 4 to an open position (not specifically shown). This will bring the portion of the cover in adjacent relation to the motion plate movement limiting opening 28 into contact with the underside of the cap 34, and this will cause the motion plate 24 to be raised away from the lower cleaning pad receptacles 22,22 of the base 16.

WO 90/08604 PCT/US90/00516 12 It is to be understood that the cover 18 could be removed entirely, and then the motion plate 24 lifted clear of the base 16 and of the compression coil spring 60 without departing from the spirit of the invention and the scope of some of the claims which follow.

!ad the apparatus been previously used, used upper cleaning pads 46,46 and lower cleaning pads 48,48 would be manually pulled from their respective cleaning pad receptacles and discarded.

Two fresh upper cleaning pads 46,46 will be chosen, and if not already fully impregnated with suitable cleaning liquid 66, these pads will be so impregnated. They will then be installed within the dished upper cleaning pad receptacles 26,26 in any usual or preferred manner which will cause them to stay in position in those receptacles. A preferred manner of accomplishing this will be detailed below.

Lower, base mounted cleaning pads 48,48 having been impregnated with suitable cleaning liquid 66, will be prepared for releasable pressure sensitive adhesion to the domed lower cleaning pad receptacles 22,22 by manual removal of the protective skin 58 from the liquid impervious substrate 56 of the handling surface 52 of these cleaning pads 48,48. Each such pad will then be installed on a top central portion of its respective lower cleaning pad receptacle 22, and will thereafter resist relative movement with respect to such lower cleaning pad receptacles until the pads are pulled from the receptacles after they have been used for their intended purpose and are to be discarded.

WO 90/08604 PCT/US90/00516 13 With all four pads so installed, the cleaning surfaces 50 of the upper pads are in facing relation to the cleaning surfaces 50 of the lower pads, or will be when the cover is closed. First, however, the contact lenses 14,14 to be cleaned are carefully placed on the very top center portions of the cleaning surfaces of the pads 46,46.

In the form of the invention as shown, the cover 18 is now brought back into place to the position as seen in FIG. 1, to position the various elements of the invention and the contact lenses as seen in FIGS. 3 and 4. A pressure and movement means is now used to consummate the cleaning action. This means, in the form of the invention as shown, includes the upper cleaning pads 46,46, the upper cleaning pad motion plate 24 and its upwardly extending boss 30 including its upper cap portion 32. This pressure and movement means is now activated by manually exerted downward pressure on the finger receiving uppier surface 40 of the upper cap portion 32 to apply pressure on the lenses 14,14 by pushing the upper pads 46,46 down against the lower pads 48,48. Next the finger applying this pressure is used to move the upper cap portion 32 relatively with respect to the cover 18, thus moving the upper pads 46,46 with respect to the lower pads 48,48. In order to provide a complete cleaning action, and to make sure that the upper pads move in "all directions" with respect to the lower pads, the finger applying the manual pressure and movement can move, carrying the upper surface 40 of the cap 34 of the upper cap portion 32 with it, to prescribe a "figure 8" motion as schematically indicated in FIG.

WO 90/08604 PCT/US90/00516 14 8. The pads 46 and 48 having been positioned firmly in the recepticles 22 and 26, respectively, it is necessary only that the coefficient of friction between the pads and the :.=eptacle exceed the coefficient of friction between the pads and the lenses. It is preferred that the cleaning surfaces of the pads 46 and 48 are of similar or identical materials; and it is expected that the upper and lower surfaces of the contact lenses themselves will have substantially equal coefficients of friction whether in touch with the cleaning surface of the upper pad or the cleaning surface of the lower pad.

This being the case, the relative movement of the cleaning surfaces of the upper and lower pads with respect to each other will result in the movement of the upper surface of the contact lens with respect to the lower surface of the upper pad being substantially equal to the movement of the lower surface of the contact lens will have with respect to the upper surface of the lower pad. Thus, after sufficient movement of the upper cleaning pads 46,46, the entire upper and lower surfaces of the contact lenses 14,14 will be properly cleaned. If a uniform figure of eight motion is used, the net movement movement of each lens away from the center of the lower cleaning pad 48 and the lower cleaning pad receptacle 22, for example, will be negligible.

Since both lenses 14 are being cleaned at the same time and since the liquid 66 is in intimate contact with both surfaces of both lenses, the lenses can be left in the apparatus (possibly with a weight replacing the finger on surface 40 of the cap 34) until any recommended period for exposure to a WO 90/08604 PCT/US90/00516 15 cleaning or disinfectant liquid 66 being used has expired.

After the lenses have been thoroughly cleaned, the moving finger (or weight) will be .withdrawn and the compression coil spring 60, acting on the downwardly extending motion plate boss 64, wil'l cause the motion plate 24 to again move to its cen=ral position, and the spring will also cause the motion plate and its upper cleaning pad receptacles 26,26 to carry the upper pads 46,46 away from the contact lenses 14,14.

The cover 18 can now be raised moving the motion plate and its attached upper cleaning pads 46,46 away from the lenses. Using sterile techniques, the now disinfected and cleaned lenses 14,14 can be reinserted into the eyes of the wearer.

The method of use of the apparatus of the invention has been explained in terms of the apparatus shown herein. It is to be understood, however, that many forms of apparatus can be utilized to perform the method of the invention. For example, and very specifically, by having upper pads with upper handling surfaces covered with releasable pressure sensitive adhesive and with the lower handling surfaces of the lower cleaning pads also covered with such releasable pressure sensitive adhesive, one lower pad can be placed on the left thumb of a user, a lens to be cleaned can be placed in the center of the cleaning surface 50 of the lower pad, the center of an upper pad 46 adhered to the index finger of the left hand, and the concave upper pad brought down on the concave/convex compact lens and on the convex lower pad. The thumb and index WO 90/08604 PCT/US90/00516 16 finger can then be moved with respect to each other, and the contact lens will be cleaned using the method of the invention and without any possibility of deleterious substances on the hands of the operator causing any difficulties in disinfecting, neutralizing or cleaning the lens. When the cleaning action is completed, the index finger will be lifted away from the thumb, and the cleaned lens will be ready to be reinserted into the eye of the wearer.

This use of the thumb and finger of one hand as an essential part of the pressure and movement means of the present invention presents a method which is covered by the present invention.

The invention herein is described and illustrated with reference to concave/convex contact lenses. The invention is equally applicable to other shapes of lenses (flat lenses, for example) and other plates or discs.

Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention.

Claims (13)

1. Apparatus for cleaning concave/convex contact lenses including: a pair of cleaning pads for each lens to be cleaned, each pad being partially defined by a pair of opposed, spaced-apart, roughly parallel, working surfaces, a first of such surfaces being a cleaning surface and a second of such surfaces being a handling surface, each pad being so constituted and constructed that its cleaning surface readily conforms to and comes into intimate contact with one of the concave and convex surfaces of a contact lens to be cleaned when the pads are positioned with their cleaning surfaces in facing relation to each other with the lens to be cleaned therebetween and when pressure toward the lens is applied to the opposed handling surfaces of the pads; wherein pressure and movement means is provided to apply such pressure to the pads toward the lens and to apply relative lateral movement to the handling surfaces of the pads to tend to move the pads laterally with respect to each other when said lens to be cleaned is so positioned between the pads; WO 90/08604 PC/US90/00516 18 wherein cleaning surface portions of both pads are of materials which will not tend to abrade the lens being cleaned, and wherein the handling surface portions each have a coefficient of friction with respect to that part of the pressure and moving means in contact with that handling surface portion compared to the coefficient of friction between the pad cleaning surfaces and the lens such that movement of the pads laterally with respect to each other will result primarily in movement of the cleaning surfaces of the pads over the concave and convex surfaces of the lens when the lens to be cleaned is so positioned.

2. The apparatus of claim 1 wherein: at least portipns of the pads adjacent the surfaces are liquid absorbent.

3. The apparatus of claim 1 wherein: that portion of the handling surface of at least one of the pads which comes into contact with a portion of the pressure and movement means is covered with a releasable pressure sensitive adhesive to WO 90/08604 PCr/US90/00516 19 tend to prevent relative movement between said pad and said movement means.

4. T"h apparatus of claim 1 wherein: said pressure and movement means includes: a lens cleaning case having a base and a cover removably secured to said base, said cover being provided with a pad motion plate movement limiting opening through a top portion thereof, at least one rounded pad receptacle fixedly positioned in said base and adapted to receive the handling surface of a first of said pair of cleaning pads; a cleaning pad motion plate adapted to be positioned inside of said cover, said motion plate including an integral boss adapted to extend upwardly through, and in spaced relation to the periphery of, said movement limiting opening when said cover is secured to the base, said motion plate being provided with at least one rounded pad receptacle adapted to receive WO 90/08604 PCT/US90/005 1 20 the handling surface of a second one of said pair of cleaning pads, said motion plate pad receptacle being situated to lie in approximately concentric relation to said base pad receptacle; one of said pad receptacles is domed and the other is dished: and said motion plate boss is provided with a cap portion accessible through the cover opening for manual manipulation to press said motion plate receptacle toward said base pad receptacle laterally with respect to said base pad receptacle when said lens is in place between said pads. The apparatus of claim 4 and: resilient means between said base and said motion plate nominally urging said motion plate pad to lie in spaced relation to said base mounted pad and said motion plate to lie in contact with the underside of said cover.

6. The apparatus of claim 5 wherein: said resilient means includes a compression coil spring exerting force between said base and said motion plate. WO 90/08604 PCT/US90/00516 21

7. The apparatus of claim 4 wherein: at least portions of the pads adjacent the cleaning surfaces are liquid absorbent; and a liquid suitable for cleaning contact lenses is present, in and has been absorbed by each of said pads.

8. The apparatus of claim 4 wherein: two rounded pad receptacles are fixedly positioned in said base in side by side coplanar relation to each other: and said motion plate is provided with two rounded pad receptacles, each lying in approximately concentric relation to one of said base pad receptacles.

9. The apparatus of claim 7 wherein: two rounded pad receptacles are fixedly positioned in said base in side by side coplanar relation to each other; and said motion plate is provided with two rounded pad receptacles, each lying in approximately concentric relation to one of said base pad receptacles. WO 90/08604 PCr/US90/005166 22 A method of cleaning concave-convex lenses including the steps of: positioning each lens to be cleaned between a pair of cleaning pads to be in contact with central portions of each pad, each pad being partially defined by a pair of opposed, spaced-apart, roughly parallel, working surfaces, a first of such surfaces being a cleaning surface and a second of such surfaces being a handling surface, each pad being so constructed that its cleaning surface readily conforms to and comes into intimate contact with one of the concave and convex surfaces of a contact lens to be cleaned when the pads are positioned with their cleaning surfaces in facing relation to each other with the lens to be cleaned therebetween and when pressure toward the lens is applied to the opposed handling surfaces of the pads; applying pressure and movement means to a central portion of the handling surfaces of each pad in approximate axial alignment with the center of the lens; and WC 90/08604 PC/US90/0016 23 causing the pressure and movement means to press the pads toward each other and to move the pads with rsspect to each other radially of :ne lens in all directions by a distance ncz greater than the largest radius of the lens being cleaned.

11. The method of claim 10 wherein: the step of moving the pads with respect to each other in all directions includes moving one of the pads to have its central portion perform a figure eight movement with respect to the central portion of the other pad.

12. The method of claim 10 wherein the cleaning surface portions of both pads are of materials which will not tend to abrade the lens being cleaned and at least portions of the pads adjacent the cleaning surfaces are liquid absorbent, including: the further step of impregnating the absorbent portion of at least one of the pads with an appropriate lens cleaning liquid before the step of positioning the lens to be cleaned between the cleaning pads. WO 90/08604 PC/US90/00516 24

13. Apparatus for cleaning lenses including: a pair of cleaning pads for each lens to be cleaned, each pad being partially defined by a pair of opposed, spaced-apart, roughly parallel, working surfaces, a first of such surfaces being a cleaning surface and a second of such surfaces being a handling surface, each pad being so constituted and constructed that its cleaning surface readily conforms to and comes into intimate contact with one of the opposed surfaces of a contact lens to be cleaned when the pads are positioned with their cleaning surfaces in facing relation to each other with the lens to be cleaned therebetween and when pressur) toward the lens is applied to the opposed handling surfaces of the pads; wherein pressure and movement means is provided to apply such pressure to the pads toward the lens and to apply relative lateral movement to the handling surfaces of the pads to tend to move the pads laterally with respect to each other when said lens to be cleaned is so positioned between the pads; WO 90/08604 PCT/US90/00516 25 wherein cleaning surface portions of both pads are of materials which will not tend to abrade the lens being cleaned, and wherein the handling surface portions each have a coefficient of friction with respect to that part of the pressure and moving means in contact with that handling surface portion compared to the coefficient of friction between the pad cleaning surfaces and the lens such that movement of the pads laterally with respect to each other will result primarily in movement of the cleaning surfaces of the pads over the opposed surfaces of the lens when the lens to be cleaned is so positioned.

14. A method of cleaning lenses including the steps of: positioning each lens to be cleaned between a pair of cleaning pads to be in contact with central portions of each pad, each pad being partially defined by a pair of opposed, spaced-apart, roughly parallel, working surfaces, a first of such surfaces being a cleaning surface and a second of such surfaces being a handling WO 90/08604 PC/US90/00516 26 surface, each pad being so construc.ted that its cleaning surface readily conforms to and comes into intimate contact with one of the opposed surfaces of a contact lens to be cleaned when the pads are positioned with their cleaning surfaces in facing relation to each other with the lens to be cleaned therebetween and when pressure toward the lens is applied to the opposed handling surfaces of the pads; applying pressure and movement means to a central portion of the handling surfaces of each pad in approximate axial alignment with the center of the lens; and causing the pressure and movement means to press the pads toward each other and to move the pads with respect to each other radially of the lens in all directions by a distance not greater than the largest radius of the lens being cleaned. 27 An apparatus as claimed in claim 1 or 13, substantially as herein described with reference to the accompanying drawings.

16. A method as claimed in claim 10 or 14, substantially as herein described with reference to the accompanying drawings. DATED this 16th day of May, 1994 MARY B BECKRICH WATERMARK PATENT TRADEMARK ATTORNEYS THE ATRIUM 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 AUSTRALIA i