Ajna is symbolisedby a lotus with two petals, and corresponds  to the colors violet, indigo or deep blue.

Ajna (along with Bindu), is known as the third eye chakra and  is linked to the pineal gland which may inform a model of its  envisioning. The pineal gland is a light sensitive gland that  produces the hormone melatonin which regulates sleep and  waking up. Ajna’s key issues involve balancing the higher &  lower selves and trusting inner guidance. Ajna’s inner aspect  relates to the access of intuition. Mentally, Ajna deals with  visual consciousness. Emotionally, Ajna deals with clarity on  an intuitive level (According to Wikipedia).

This chakra is the sixth chakra and known as the third eye or Ajna. It is related to physic and  intuitive abilities so allows us to see clairvoyantly and communicate telepathically when  activated (Debbie Creagh).

This chakra relates to the phyiscal functions of the Pineal Gland, Pituitary Gland, muscles of the  eyes and brain functions. Congestion of this chakra therefore can result in Poor Vision, Sinus &  Nose Problems, headaches, seizures, learning disability, nerve problems, neurological problems (Lee Wei-Dei).

 (Citing Siam Reiki materials)

The Sixth Chakra – The Third Eye Chakra