I see that most of the discussion here has focused on the physical effects, but this video is looking beyond those and hinting at profound psychological revelations as well. It maybe helps to look at this sort of thing from another angle, from ground that we can easily relate to. There is a parable in the Bible in the Gospel of John that is a brilliant analogy: Jesus heals a man born blind, and his whole world changes. It isn't all straightforward though, because people who know him don't recognise him - he is bound up in their minds with a blind persona. He loses his livelihood - he can't sit and beg as a blind man any more. He no longer fits in and is rejected by the religious authorities who sling him out of their community. But he can now see! I'd love to know what happened to him subsequently.
Like all good parables, this tale works at many levels. It's not just ordinary sight that is being explored, but a change in insight as well - an insight that can change our destiny, our hopes and fears, our loves and friendships. There are risks.
The video is referring to the possibility of experiences akin to this - the possible sudden awakening of faculties and perceptions that are unexpected - which can crash in on us with the same intensity that sudden sight would have on us if we'd been born blind. When someone hasn't experienced them, they have no way of anticipating or imagining them, and, if they are referred to, doubt their existence. If it happens that one of these faculties is awakened in them, the effect can be just as dramatic as being able to see for the first time ever - and it might easily break someone who isn't prepared, depending on what awakens and what it 'sees'. The blind man no doubt gets plenty of help from people around him who can see already, but few people around us have experienced the kinds of awareness that this video alludes to, so there may be no-one to help. You are like a new-born child having to learn to make use of your eyes, without parents to guide you - seeing yourself and the world for the first time, with no easy way to integrate and structure what you are experiencing. It can be terrifying as well as ecstatic initially. When (if) you get used to it, it can be isolating because it's so hard to share with anyone who has no real feel for what it is that you are 'seeing' - it sounds unlikely and hypothetical to them while to you it's as clear and obvious as ordinary sight. Even those who are receptive and drawn toward that sort of experience, but haven't woken to it, tend to distort it and go charging off in all kinds of directions at right angles to where the heart of it lies. So it can become a secret locked up inside you that you are not able to share easily and you end up looking at the world as an outsider rather than a participant if you aren't careful.
This sort of awakening is actually only an event along the road, and the path leads on beyond - it's not good to make them an end in themselves but to treat them as milestones along the paths of our lives.
