Watchful Eye

You enchant a preserved eyeball to watch over all it sees and magically remember what passes before it. The eyeball cannot move, its eyesight is limited to the range given, and the eye does not gain darkvision or other special sights unless further enchanted (eyes from creatures with such vision retain that vision when enchanted, like the dragon’s ability to see invisible beings).

When you return and pick up the eye, you see all that the eye has seen if it is still intact. If the eye has been shuttered, you see nothing. If the eye has been magically blinded, you must make the saving throw against the spell as if you had been its intended target.