The ornamental design for a contactlenscase, as shown and described.
FIG. 1 is a top perspective view of a contact lens case showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front side perspective view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a top perspective view with the base and cover unattached.
Those portions of the figures that are presented in broken lines merely illustrate the environment of the design and are not part of the claimed design.