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The Third Eye
Our third eye is one of the seven primary chakras (brow chakra) and is located between your eyebrows, but slightly raised (mid forehead). To develop this region gives you certain attributes such as better visualization, increased psychic perceptions, and better creativity. This is why they associate the sixth chakra with "vision and thought" because this is where we "see" things.
There really is only ONE eye (your third eye) but while we're in the physical, we have our two physical ones, plus our "third" unseen one. The real vision is in your third eye. If you close your eyes and "see" in front of you, you'll notice that you're really seeing everything from the third eye location. If you put your fingers over your closed eyelids, you'll notice that there is NO sight coming from the area of your two eyes. Close your eyes and imagine an object, then put your finger on where you see the object, you will have then located the third eye.
When I'm working on my remote viewing, I work this chakra prior to my session. This can also help in astral projection because third eye stimulation increases lucid dreams (again because this is the "vision" center) and from more clear and lucid dreams, we can program ourselves to turn this into a projection.
I stimulate my third eye by imagining white energy swirling around it. Within seconds, I can feel the pulse and swaying of it actually opening up (chakras are also associated with "wheels" or "petals" which spin and open).