The Eye can radiate a blinding light of immense mystic force, which also dispels disguises and illusions. It can amplify already existing mental talents, enabling a moderate psychic to "read" or even partially control another mind. The Eye can summon images of the past, and track both corporeal and ethereal beings by their psychic or magical emissions. The Light of the Eye is effective against a variety of evil threats, including all undead, demons, devils and dark extradimensional entities. The Light can even harm human practitioners of the Dark Arts, if they have become sufficiently corrupt.
Strange Tales #128 (1965)
Description of powers (The Official Handbook Of The Marvel Universe Mystic Arcana: The Book Of Marvel Magic #1, 2007)
The Eye of Agamotto is the mystic amulet bestowed by the Vishanti upon the individual designated as Earth's Sorcerer Supreme.