Clear seeing with the Inner Eye (or Third Eye as most often referred to) is a capacity all have but for most people, it is a latent capacity. There are reams of accounts of what happens when the Third Eye opens to clear seeing, and how to get that to happen. There are some that purport to teaching this process. Some people are born with this capacity and never lose it. To some, the opening can seem to happen on its own, much like some kundalini experiences that can show up unbidden. Children are born with the openness but can shut down quickly when they assess where they are and the unacceptibility of their gift to many who are threatened by it.
When the Third Eye is open as a stable part of one's life, life is far from what it would be were the capacity unactivated. I feel the opening is an earned reward for commitment to the desire to see clearly and to see all things from the heart. Who knows how many lifetimes of devotion and commitment lead to this treasured state of clarity.
But then, we are living in these times, and these are not times as they have been in many eons, if ever. These times need, nay, require that masses of people come into clear seeing. Having the Third Eye open is now no longer the province of the esoteric elite. If you, from your heart, want to live a life seeing from your heart, then you are eligible to open either through assistance (Drunvalo Melchisidek is a good resource), from a miracle (it happens on its own) or through some private form of study you have found and undertaken.
Warning. Be careful what you ask for. When you see with the Third Eye, there is no way you can hide from yourself anymore, in any manner, and no one can hide from you. Some people will appreciate you for this capacity, but not everyone. Personally, I think by the time you pass muster and see clearly in a way that far exceeds anything external physical vision offers you, you will know how worth it this gift is, whatever it took to get here. And this is definitely a case of, the more the merrier. The joy of looking into the eyes of one who is clear seeing with your own clear seeing eyes, well, it is unsurpassed.