The ornamental design for an eyewearstrap, as shown and described.
FIG. 1 is a front view of my new design for an eyewear strap;
FIG. 2 is a top view of the eyewear strap, the bottom being a mirror image thereof; and,
FIG. 3 is an end view of the eyewear strap, the other end being a mirror image thereof.
The matter shown in dashed line depicts environmental subject matter and forms no part of the claimed design.
The eyewear strap is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.