What Is Deja Vu and Why Do We Experience It?

You Have A "Dominant Eye"

While you might think of your eyes as pair with each eye being equal, most people have a dominant eye, which could contribute to feelings of déjà vu, Dr. Michael Roizen and Dr. Mehmet Oz explained in the Cleveland Plain Dealer. "If that stronger eye sends information to the subconscious before both eyes focus and register the input as a conscious experience, your brain will tell you, 'I've seen that before.' And you have — but it was just a nanosecond ago." There's no scientific evidence to back up this theory right now, though.