The Byakugan

The Byakugan (白眼, Byakugan? literally "White Eye," English manga "Evil Eye") is an eye technique (瞳術, dōjutsu?) that naturally occurs in members of the Hyuga clan.[13] Byakugan possessors are characterized by their white, pupil-less eyes. When the Byakugan is activated, their pupils somewhat appear and the veins near their temples bulge. Protection of the Byakugan ability is very important to the Hyuga clan, and has led to the development of an elaborate family hierarchy. Members of the lesser branch house are branded with a cursed seal on their forehead at a young age. Whenever a branch house member dies, the cursed seal will seal the Byakugan ability so that enemies will not be able to discover its secrets.

A person with the Byakugan has a nearly 360 degree field of vision, except for a small blind spot at the back of the neck above the third thoracic vertebra.[14] Byakugan users can detect anything around them within a small radius, the greater the user's skill with the Byakugan, the larger the radius is, which makes them close-range combat experts. The Byakugan also gives the user the ability to see through almost any matter over extremely long distances. A small degree of telescopic vision is also present, as a Byakugan user can focus on a single object at any point within their range of vision.[11] Possessors of the Byakugan are also capable of using the Gentle Fist style of combat, because the Byakugan can detect one's chakra network