The inner eye is not used here to describe the third eye itself. Although these terms are commonly exchanged, we use it as a generic label which encompasses abilities pertaining to "mental vision" - of elements located outside of the perceptive field of our five senses. 

The method is easy to apply. All one has to do is to shut off all mental noise. This aligns all levels of existence and allows..

1. Remote vision over distance, realms of reality, and time.
2. Proper use of divination devices like runes or Tarot.

3. Sharp empathy.
4. And helps maximizing the effect of all other abilities.

The trick is to use the voice in your head, and train yourself to gradually silence it, rather than abruptly forcing it to silence at once. When your hear that voice speaking, simply cut it. Shorter and shorter as you get used to this exercise.

For example :

• I want to... 
• I want...
• I wa... 
• I...
• ...

Once you are able to enter a state of mental silence, visions, sounds, and feelings will simply come to you, as well as information from a higher source that was previously inaccessible, while the mental dialogue was chattering away. To orient the process, think about your question or target before emptying your mind. And that's it. This can be used in combination with tools like Tarot, and good divination practice also allows dialog with any higher entity, such as divine guardians or higher selves.

See also: The Power of Now - as the state of "being in the now" is what we aim to achieve through the above method, complete presence in current activities.