The third eye is something I have read and talked with others about before. I have not heard of this connection to the pineal gland.
What I know is the third eye is the subconscious, meditative high conscious. It is something that is often seen when people have Reiki as treatment, as Reiki takes you into another consciousness. I have had Reiki treatment in the past and seen the 3rd eye as I was taken down into another consciousness.
Reiki is a Japanese technique which deals with life force energy which flows through us and is what causes us to be alive. If one's "life force energy" is low, then we are more likely to get sick or feel stress, and if it is high, we are more capable of being happy and healthy. Reiki is about balancing the chakra's.
It also works in conjunction with all other medical or therapeutic techniques to relieve side effects and promote recovery however you should always talk to your GP/Consultant before using. The Reiki provider should always go through your health checks and provide you with a form to fill in about your health and medication.
It should NEVER be used on it's own though as the only way of healing. After all if you have a belief system of faith you will then believe that ''God'' as you do or do not understand it gives medical training and medical hands to the GP's surgeons consultants and so on
Whilst Reiki is not actually laying hands on and works by the aura/life force or whatever you wish to call it, there are some ''treatments'' such as reflexology which whilst beneficial (as it is to me) that can't always be used on others. For instance my husband isn't allowed to use reflexology has a form of beneficial rebalancing of the body, because of his health conditions.
Going back to the 3rd eye I would expect many to scoff at it as if you dont have a belief system be it of faith or otherwise and simply believe once your dead your dead, then it is unlikely you will believe in the third eye.
I can't comment on whether that is related to the Pineal gland has I haven't looked at that. My learning's of the 3rd eye have come through spiritual matters. Sas is quite correct that the spiritual belief systems of this world all have some way of perceiving the 3rd eye.
For anyone who wants to know anymore here is a link to an overview of the third eye and it's spiritual side. It gives a brief overview on what it is to each faith from Buddhism to todays ideas of mindfulness
Like I always say ''all things entwine''
https://en.wikipedia.org/wiki/Third_eye
