1. It is said that the sun resides in the right eye, the moon resides in the left eye. The right and left eyes symbolise good and bad, light and dark, greed and contentment and other attributes of similar nature. The eyes are there for outward perception, to see the world as it is. 

2. The third eye is the eye of knowledge. It is to see that which is beyond perception. Hence, it is placed between the two eyes on the forehead. As per Hindu culture it is important to put vermilion, kumkum and tilak to stabilise the wise mind. 

3. In the beginning of times, when Brahma and Vishnu both were looking for the source of energy- it emerged there as a beam of light. They could not find it, and Brahma decided to lie about it-just to prove his superiority. Shiva came out of the beam, and the whole energy coiled up at his forehead into his third eye. This itself proved the power of Shiva. Shiva used his third eye to create as well as destroy. 

4.  After the death of his beloved wife Sati, Shiva went into a deep reflective state ‘Samadhi’, and refused all worldly attributes. Nevertheless, for the survival of the world it was necessary for Shiva to marry Parwati, who would be the goddess the world needed. Hence, to wake him up from the samadhi, Kamdev shot an arrow which would awaken the desires in shiva and he would come out to his pensive state. 

5. As soon as the arrow struck Shiva’s heart, all three eyes opened at once. The energy from his third eye was so strong that Kamdev could not bear it. His body turned into ashes. Some say that it was Shiva's way of negating the desire. This cannot hold true, as Shiva is said to be equal to thousand Kamdevs. He is the one who gave us Kamshastra. He is  the creator of carnal attributes. He does not negate desires. He is, in fact, the origin of all desires. It was not his denial of desires, rather it was his sudden awakening that burnt Kamdev. 

6. Once Parwati shut both his eyes playfully, not realising that by shutting his eyes the world would turn dark as sun and moon both got eclipsed by her hands. The universe lost all his light as the sources of light, the sun and the moon, were both in shiva’s eyes. Shiva, thus had to open his third eye to restore the brightness of the world. The Adiyogi Shiva, who is the introducer of Yog sadhna, or yoga as it is commonly called, is envisioned having a third eye in his forehead also known as the Ajna chakra. This is the sixth energy point in our body, which is associated with higher consciousnesses. Yes! Every human has it. Then why is it Shiva who is pictured having a third eye. As I mentioned earlier, Shiva is the creator of Yog sadhna. His third eye is all powerful. This is the delineation that if one follows the yogic lifestyle, he is capable of opening his third eye. When your third eye is activated, you can see beyond perceptions. Your physical eyes can only see what can be comprehended, but your third eye can see that which is not comprehensible.