The ornamental design for the eyeglass lens, as shown and described.
FIG. 1 is an elevated left front perspective of the eyeglass lens
FIG. 2 is a front view thereof;
FIG. 3 is a right perspective view thereof; and,
FIG. 4 is a left perspective view.
The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the eyeglass lens and environmental structure and form no part of the claimed design.