fig1 shows a perspective of a first embodiment of the invention . a container 2 has a lens 4 therein . the lens may be a hydrophilic soft contact lens , a hydrophilic intra - ocular lens , or other liquid ( polymethyl methacrylate ) or gas - permeable , or glass optical element . the container 2 is filled with a liquid 6 , which is preferably a saline solution , but may be any solution designed to maintain the properties of the lens 4 . a cylindrical neck 8 provides communication with the interior of the container 2 and is sealed with a lid 10 . the cylindrical neck 8 is located adjacent the portion of the container 2 which receives the lens 4 and extends above the container to provide a void 12 . this void exists because it is almost impossible to completely fill any rigid container with liquid . for example , the entire container is typically sterilized by the manufacturer , and it may be necessary to have a small void to account for expansion and contraction due to temperature changes . furthermore , it is extremely difficult and expensive to provide a mechanism for completely filling the container . the arrangement provided by the invention removes the necessity of completely filling the container , since the void 12 is located away from the portion of the container having the optical element 4 . the void 12 is thus not in the optical path of the testing instrument and does not interfere with the test . the container 2 , shown in fig1 has two sets of optical surfaces . a first set 14 comprises parallel optical surfaces which permit a measurement of the profile of the optical element 4 and will be described in more detail below . a second set of surfaces 16 comprises parallel surfaces which permit the measurement of the optical power of the optical element 4 as will be more fully described below . fig2 shows a side view of the container 2 and illustrates how the optical element 4 resides in the cavity of the container . the portion of the container immediately under the cylindrical neck 8 may preferably contain a label 18 for carrying information such as the name of the manufuacturer and the characteristics of the optical element 4 . the surfaces 14 and 16 are preferably optically flat . this configuration has no optical power and thus simplifies testing . it is possible , however , to provide curvature to these surfaces . if the curvature is accurate and known , an appropriate correction to the measured power may be made . furthermore , if the index of refraction of the liquid 6 matches that of the container material , the interior surfaces may be of any shape since they will not have optical power . fig4 shows the container of the invention located in an optical testing apparatus . a light source 20 illuminates a collimating lens 22 so that the container 2 is illuminated with collimated light . light passes through the optical surfaces 16 and through the optical element 4 which is located between the surfaces . a second lens 24 forms an image of the light source 20 on a screen 26 after reflection from mirror 32 , and the position of the lens 24 or the lens 22 , required to produce the image , gives and indication of the optical power of the element 4 . since the optical element 4 is suspended in a fluid 6 , the actual power of the lens 4 in air may be determined by multiplying the power determined in accordance with the apparatus shown in fig4 by a predetermined factor . this factor is determined on the basis of the difference between the index of refraction of the liquid 6 and that of the lens 4 . fig5 shows how the profile of the lens 4 may be measured . light from the source 20 is collimated by the lens 22 and is directed onto a first mirror 28 . light reflected from the mirror 28 is directed onto a first of the optical surfaces 14 , through the lens 4 , through the second of the optical surfaces 14 , onto a second mirror 30 , through lens 24 , onto a reflective surface 32 and onto the screen 26 . the lens 22 or lens 24 may be moved to focus an image of the profile of lens 4 on the screen 26 . the practitioner may then view the screen 26 to determine whether the curvature of the element 4 and the cord and sigital dimension of the element are acceptable . if the depth of field of projection lens 24 is small , selected profiles may be examined by moving lens 24 to focus a selected profile on screen 26 for measurement . it will be appreciated that the only change required between the test shown in fig4 and that shown in fig5 is the position of the light source and collimating lens 22 with respect to the container 2 and the mirrors 28 and 30 . fig6 is a plan view of the instrument shown in fig4 and 5 . this demonstrates how the portion of the container 2 having the optical element 4 therein is aligned between the mirrors 28 and 30 . fig7 is an illustration of indicia which may be provided on the screen 26 to permit a direct measurement of the image of the optical element 4 to determine the curvature of the lens and the cord and sagital lengths . a first set of curves 34 represents a plurality of standard curvatures which may be compared with the image of the profile of the lens 4 . a linear measurement scale 36 permits the determination of the sagital depth of the optical element 4 , and a linear measurement scale 38 permits determination of the cord length of the optical element 4 . the indicia 34 , 36 , and 38 may also be etched into one of the optical surfacs 14 so that the lens 24 projects an image thereof onto the screen 26 along with an image of the lens 4 . a second embodiment of the invention is shown in fig8 and 9 . in accordance with this embodiment , the container 2 is located within a cavity formed by a first set of parallel elements 40 and a second set of parallel elements 42 . end elements ( not shown ) may be used to provide a completely closed cavity for receiving the container 2 , if desired . the container 2 is supported between the surfaces 40 and 42 by any known means , and a tube 44 communicates with the cylindrical neck 8 . this arrangement permits the void 12 to be located adjacent and vertically above the portion of the container 2 having the optical element 4 therein . fig9 shows how the surfaces 42 operate in a manner similar to the mirrors 28 and 30 shown in fig4 through 6 these surfaces may be coated with a reflective material 46 . also , the interior surfaces of the elements 42 may be coated with an anti - reflective coating to prevent liqht loss . the incident light beam thus reflects off a first surface 42 toward the container 2 and from a second surface 42 to a screen . the embodiment shown in fig9 comprises two separate parts with the container 2 being enclosed by the surfaces 40 and 42 . in an alternative embodiment , a solid prism having exterior surfaces in the configuration of surfaces 40 and 42 would have a hollow chamber for receiving the optical element 4 . a passageway would be bored through the solid material , such a plastic , in a configuration similar to that of the tube 44 and the neck 8 . this embodiment would operate in substantially the same manner as does the embodiment shown in fig8 and 9 . it will thus be appreciated that a novel container has been shown and described wherein an optical element may be stored in a sterile chamber and subjected to optical testing without the necessity of removing it from the chamber . the optical test is not affected by any air - liquid interfaces caused by a void in the chamber . modifications within the scope of the appended claims will be apparent to those of skill in the art .