Device for inserting and removing contact lens

A shaft member is slidably mounted in a flotation chamber. Liquid is fed to the flotation chamber from a liquid storage chamber through a constricted tube when the storage chamber is squeezed, thereby slowly raising the liquid level in the flotation chamber. By virtue of the buoyancy provided by the liquid, the shaft is raised vertically within the flotation chamber as the storage chamber is squeezed and the flotation level in the flotation chamber raised. Means are provided on the end of the shaft for supporting a contact lens. An eye piece is mounted on the device around the end of the shaft, such that the user's eye can be placed on the eye piece and the contact lens raised into contact with the eyeball in its installed position. The eye piece used for inserting the lens is removable and can be replaced with an eye cup which can be filled with liquid for use in removing the lens by bathing it out.

This invention relates to a device for inserting and removing a contact 
lens, and more particularly to such a device which employs a rod for 
supporting the lens, which is raised to the eyeball in a flotation 
chamber. 
The insertion or removal of contact lenses manually by persons having 
unsteady hands is difficult, if not impossible. Various devices have been 
developed for aiding in the insertion and removal of contact lenses, but 
none of these have been found to be as effective as would be desired for 
use by persons with unsteady hands. Thus, U.S. Pat. No. 3,934,914 to 
Carruthers, U.S. Pat. No. 3,922,025 to Updegraff, U.S. Pat. No. 3,129,971 
to Kobler, and U.S. Pat. No. 3,791,689 to Boone, each shows a different 
hand held device in which the contact lens is held by suction while the 
device is positioned manually to place the contact lens on the user's 
eyeball. U.S. Pat. No. 3,304,113 to Hutchison, and U.S. Pat. No. 3,910,618 
to Massenz, each shows a stand-held device in which an applicator for 
holding the contact lens is spring loaded and the eye is moved down into 
contact with the applicator. U.S. Pat. No. 3,600,028 to Henning describes 
a device for inserting and removing contact lenses which is mounted on a 
support stand and with which the user's eye is brought into contact with 
the applicator, whereupon an illuminating light is extinguished and the 
applicator is moved away from the user's eyeball. 
The device of the present invention is an improvement over the 
aforementioned prior art devices in that it only requires of the user that 
he place his eye in position over a stand-supported eye piece and apply 
squeezing pressure to a liquid storage chamber supported on the stand to 
cause the lens to be inserted on the eye. To avoid the possibility of 
injury to the eye and to facilitate control of the movement of the 
positioning device, this positioning device is in the form of a rod member 
which is placed in a flotation chamber, the upward movement of the rod 
towards the eye being effected by raising the flotation level of the 
liquid in the flotation chamber. This change of flotation level in 
response to squeezing pressure of the operator is made very gradual by 
virtue of a constricted metering tube which interconnects the flotation 
chamber and the liquid storage chamber. The flotation member has a 
relatively small volume so that its buoyancy is limited, such that it will 
offer little resistance to inadvertent movement of the eyeball 
thereagainst. The device of the invention is of relatively simple and 
inexpensive construction which can be counted on for reliable operation 
over long periods of use, and is very simple and easy to operate even in 
the case of persons having very unsteady hands. 
It is therefore an object of this invention to provide an improved device 
for inserting and removing contact lenses which is particularly suitable 
for persons having unsteady hands. 
It is a further object of this invention to provide a simple device of 
highly economical construction for use in inserting and removing contact 
lenses.

Briefly described, the device of my invention is as follows: 
A flotation chamber in the form of a vertical column and a liquid storage 
chamber are mounted on a stand. The storage chamber and the flotation 
chamber are interconnected by means of a constricted tube. The liquid 
storage chamber has flexible walls such that when these walls are 
squeezed, liquid is forced through the constricted tube into the flotation 
chamber, raising the level of the liquid therein in accordance with the 
squeeze pressure applied to the storage chamber. A rod member is placed in 
the flotation chamber, with freedom for vertical motion therein such that 
as the liquid level in the flotation chamber is raised, the rod will be 
floated in the liquid and will rise as the level of the liquid rises. 
Thus, as the liquid storage chamber walls are squeezed, one end of the rod 
slowly rises out from the top of the flotation chamber to a vertical 
position which can be controlled in accordance with the squeezing pressure 
applied to the liquid storage chamber. An eye piece having an aperture in 
the bottom thereof is mounted on the top portion of the flotation chamber 
to permit the user of the device to position his eye above the rod. The 
contact lens is placed on a cap member on the top of the rod and with the 
eye in position on the eye piece above the rod, the storage chamber walls 
are squeezed to bring the contact lens into proper position against the 
eyeball. The apertured eye piece used for inserting the contact lens can 
be replaced with an eye cup filled with water which can be used to remove 
the lens. 
Referring now to the drawings, a preferred embodiment of the invention is 
illustrated. Rectangular block 11 forms a stand on which flotation chamber 
14 and liquid storage chamber 15 are supported. Flotation chamber 14 may 
be in the form of a tube which is cemented and/or bolted to stand 11, with 
a cylindrical chamber 14a being formed in the center thereof. Flotation 
chamber 14 and stand 11 may be fabricated of a suitable hard plastic 
material. The top wall portion 14b of the chamber is undercut providing a 
ledge 14c. Slidably supported over undercut portion 14b and resting on 
ledge 14c is a cylindrical support member 15 which may be integrally 
formed with eye piece 16, or may be joined to the eye piece to form a 
two-piece assembly. It is to be noted that the eye piece assembly and its 
support are supported on chamber 14 for ready removal therefrom so that it 
can be replaced with eye cup 18 and its associated support 19, shown in 
FIG. 4, this second assembly being utilized in removing a contact lens. 
Eye piece 16 has an aperture 16a formed in the bottom thereof to permit the 
passage of rod member 20 upward to the user's eye, as shown by the dashed 
outline of rod 20 in FIG. 3. Rod 20 may be hollow, as shown in FIG. 3, and 
sealed on the bottom end by means of a plug 21 and on the top end by means 
of a cap 22. Cap 22 is formed from a ring member 22a which forms the outer 
periphery thereof, and a dome shaped central portion 22b. It is to be 
noted that rod member 20 can be solid in lieu of being tubular, as shown 
for the preferred embodiment. Rod member 20 is slidably supported in 
sleeve member 24 which has a top circular lip portion 24a which rests on 
the top edge 14d of chamber 14. It is to be noted that rod member 20 is 
loosely fitted within sleeve 24 so as to permit access of the ambient air 
to the interior 14a of the chamber. 
The interior of liquid storage chamber 15 is joined to the interior of 
flotation chamber 14 by means of a constricted tubular passageway 25 
formed in the cap 15a of chamber 15, and the wall of chamber 14. 
With rod 20 in its initial at-rest position, as shown in FIG. 3, the level 
of the liquid 30 within chamber 14 should be beneath the bottom-most 
portion of rod 20 with the rod in its lowermost position. In the use of 
the device, a contact lens is placed on cap 22 with the center of the lens 
resting on dome shaped portion 22b (as shown in the dashed illustration of 
FIG. 3). Liquid storage chamber 15 has walls which are flexible and when 
these walls are squeezed, as indicated by the dashed line in FIG. 2, 
liquid is forced from chamber 15 through passageway 25 into chamber 14. 
With increased pressure, the level of the liquid 30 within chamber 14 will 
gradually be raised until it reaches the level at which the rod will 
commence floating in the liquid. Then, as the liquid level is raised still 
further, rod 20 will be raised in accordance with its flotation level. 
Thus, the contact lens 32 placed on cap 22 will be raised upwardly until 
it comes into contact with the user's eye which is positioned along the 
edges of eye piece 16. 
In view of the fact that the device is not held in one's hand but rather 
rests on stand 11, which is supported on a suitable table, the fact that 
one has an unsteady hand does not detract from the ability to insert the 
lens, as the hands need only by used to squeeze the walls of chamber 15 
and not to position the lens. It is further to be noted that due to the 
fact that rod member 20 is driven upwardly purely by virtue of its 
flotation in the liquid contained within chamber 14, it exerts minimal 
upward pressure and offers little resistance to downward pressure so as to 
minimize the likelihood of injury to the eye during or after insertion of 
the contact lens. 
The contact lens may be just as easily removed by placing eye cup 18 and 
its support 19 (shown in FIG. 4) in the same position occupied by eye 
piece 16 and support 15 in FIGS. 1-3. With eye cup 18 filled with water, 
the lid of the eye is held open and the eye is lowered into the water. 
Upon rotation of the eye under the water, the lens will readily float out 
from the eye into the cup. 
While the invention has been described and illustrated in detail, it is to 
be clearly understood that this is intended by way of illustration and 
example only and is not to be taken by way of limitation, the spirit and 
scope of this invention being limited only by the terms of the following 
claims.