The Third Eye can see beyond the physical,into higher frequencies.
The pineal gland is occasionally associated with the sixth chakra (also called Ajna or the third eye chakra in yoga). It is believed by some to be a dormant organ or black hole that can be awakened in Entered to enable,Third eye vision telepathic communication and Astral Travel.

In the physical body the eye views objects upside down. It sends the image of what it observes to the brain which interprets the image and makes it appear right side-up to us.

But the human body has another physical eye whose function has long been recognized by humanity. It is called the 'Third Eye' which in reality is the Pineal Gland. It is long thought to have mystical powers. Many consider it the Spiritual Third Eye, our Inner Vision.
The Pineal Gland is about the size of a pea, and is in the center of the brain in a tiny cave behind and above the pituitary gland which lies a little behind the root of the nose. It is located directly behind the eyes, attached to the third ventricle
The pineal gland contains a complete map of the visual field of the eyes