Eye

Several characters and items take the form of eyes:

Bosses

 * Eye of Cthulhu, an early boss.
 * The Twins, a Hardmode version of the Eye of Cthulhu.

Enemies

 * , a common flying enemy.
 * , the Hardmode counterpart of the Demon Eye.
 * , a zombie with a large eye.
 * , a tiny eye summoned by the Eye of Cthulhu in its first form.
 * , a big eye summoned by the Moon Lord.

Items

 * , an item that summons the Eye of Cthulhu.
 * , an item that summons The Twins.
 * , an accessory dropped by Golem.
 * , a pet summon item dropped by Eyezor.
 * , an item that summons the Twins minion.
 * , a decorative statue of an eyeball.
 * , a vanity item placed in the helmet social slot.
 * , a Hardmode Yoyo.