Lens

FIG. 1 is a top front perspective view of the claimed design; FIG. 2 is a front elevation view of FIG. 1 ; FIG. 3 is a top rear perspective view of FIG. 1 ; FIG. 4 is a rear elevation view of FIG. 1 ; FIG. 5 is a right side elevation view of FIG. 1 ; FIG. 6 is a left side elevation view of FIG. 1 ; FIG. 7 is a top plan view of FIG. 1 ; and, FIG. 8 is a bottom plan view of FIG. 1 .