The ornamental design for eye cover device, as shown and described.
FIG. 1 is a top front perspective view of the present invention.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a front elevation view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the eye cover device and form no part of the claimed design.