What's Boruto's Eye Called?

The eye that Boruto possesses is known as the Jougan. Although it has not been explicitly mentioned in the anime but the translation of a manga panel indicates so. The Jougan allows him to sense and see chakra, its pathway system and also, view the invisible barriers between different dimensions.

What is Boruto's eye Power called?

The Jōgan (淨眼, lit. Pure Eye) is a mysterious dōjutsu that is implied to belong to the Ōtsutsuki Clan, and used by those who strongly inherited the powers of the clan^{[citation needed]}. Boruto Uzumaki has so far been the only wielder of the dōjutsu, having awakened it in his right eye.

How did Boruto get his eye?

In one of their battles, the shinobi wanted to retreat but Garaga wanted to keep fighting. So the summoner betrayed him, attacking him with lightning release, blinding his right eye. This left him with a scar not dissimilar to the one Boruto has.