Mokuhyo Sougan

The Mokuhyo Sougan (Targeting binocular eyes) is the most advanced form the Sougan can take. There can be only one at any given time and can only be obtained by killing the current possesser. The pupil will change it's appearance. Blind Sougan users also get their eyesight back. The current possesser of these eyes is Terra Ruki. The Mokuhyo Sougan keeps all of the Sougan's eariler abilities and also gives the user access to a powerful jutsu called Ventus Cannon. These eyes also widen the users field of view. Like the Mangekyo Sharingan the eyes appearance seems to change from user to user, however unlike the Mangekyo Sharingan, the Mokuhyo Sougan does not cause blindness.

Terra
Terra gained his Mokuhyo Sougan by killing the previous owner, his father Raikov. Terra's varient of the Mokuhyo Sougan resembles crosshairs (fitting due to his alias as the Sniper Ninja). Terra had mastered the use of his new eyes by trial and error, as no one could teach him to use it. He also learned that the Ventus Cannon was better off left as a last resort only, due to it draining a massive amount of chakra with one use.

Raikov
Raikov gained his Mokuhyo Sougan by killing the previous owner. His varient appeared in the shape of two white half circles connected by a white line. Raikov had an easier time mastering his than his son did because the previous user had taught him all about the eyes before Raikov killed him. Also due to Raikov's massive amount of chakra, rivaling that of Kisame Hoshikaki's, Raikov was able to use the Ventus Cannon more than once.