Through this spell a caster may stretch and extend the muscles of their eyeball from it's socket to a range of 30 ft, plus 10 feet per spell slot used. The protracting eyeball is completely silent and serves as an excellent means of scouting unknown environments. The caster may turn the eyeball any direction (left, right, up, down, etc.) but may only see what is directly in front (no peripheral vision is provided unless the eyeball is turned to look in a given direction). If the muscles of the eyeball are severed, for any reason, the wizard loses the eye and 1d3 hit points permanently. Note that Zu-Pang's Protracting Eyeball works with other spells that magically enhance the eye. The eye can be recoiled by the wizard at any time as a free action. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the spell lasts an additional round per spell slot used.