Bhagavad Gita, Chapter 15, Verse 10

Him while transmigrating from one body to another, or residing in the same or experiencing, or when united with the Gunas, the deluded do not see; but those who have the eye of wisdom behold Him.

Real perception here isn't automatic, it's described as something only certain eyes, the eyes of knowledge, actually have.

Most people are named as missing the soul entirely, even while it's actively present and active. Real sight, in this case, depends on more than just having working eyes.