Does everybody have third eye or can see entities beyond the vision of our naked eyes?

Everyone has the ability to open their third eye. There is a methodical practice in the book Awakening the Third Eye by Samuel Sagan MD, currently a free download so hop to it. You can get to it via my hub Third Eye Meditation.

Vision is something that is opened, so seeing entities or presences is perhaps not something that happens automatically. Some people have the innate ability to see non physical presences and entities and ghosts or fragments of energy. Others learn the art through practice and more practice.

I can open your third eye in 10 minutes via skype if you like. But afterward it is you that must flex the muscle and use it.

I don't think any one does. I think that people who see things that other people can't are hallucinating, possible from conditions in the optic nerve or eyes, or even brain misfirings. And those people I've spoken to are unreliable witnesses, generally speaking. They are inconsistent in their stories, and often present themselves in a fashion that makes them seem like frauds.

All men have third eyes. Not on their foreheads though. Closer to the foreskin.