When this spell is employed, the wizard creates an invisible sensory organ that sends him visual information. The wizard eye travels at 30 feet per round if viewing an area ahead as a human would (i.e., primarily looking at the floor), or 10 feet per round if examining the ceiling and walls as well as the floor ahead.
The wizard eye can see with infravision up to 10 feet, and with normal vision up to 60 feet away in brightly lit areas. The wizard eye can travel in any direction as long as the spell lasts.
It has substance and a form that can be detected (by a detect invisibility spell, for instance). Solid barriers prevent the passage of a wizard eye, although it can pass through a space no smaller than a small mouse hole (one inch in diameter).
Using the eye requires the wizard to concentrate. However, if his concentration is broken, the spell does not end - the eye merely becomes inert until the wizard again concentrates, subject to the duration of the spell. The powers of the eye cannot be enhanced by other spells or items. The caster is subject to any gaze attack met by the eye.
A successful dispel cast on the wizard or eye ends the spell. With respect to blindness, magical darkness, and so on, the wizard eye is considered an independent sensory organ of the caster.
The material component of the spell is a bit of bat fur.