We claim the ornamental design for the slit lamp cover, as shown and described.
FIG. 1 is a perspective view of a slit lamp cover showing the new design;
FIG. 2 is a side view thereof, the opposite side being a mirror image of this view;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is an enlarged top view thereof;
FIG. 6 is an enlarged bottom view thereof; and,
FIG. 7 is a perspective view thereof, when with environmental structure. The broken lines in FIG. 7 are for illustrative purposes only and form no part of the claimed design.
The broken lines in FIGS. 4, 5 and 6 are included for the purpose of illustrating unclaimed portions of the slit lamp cover that form no part of the claimed design.