Well the most basic way I can share with you is by using the smudge tool. Create some layers and then each one make the eyelids come down bit by bit. In Imageready, you can then animate it to make it look smooth.
fuck a smudge tool, the smudge tool makes it look weird (like queen's eyes in life's sig) ... use the clone stamp tool and actually move the eye down on each frame, makes it look much smoother