Interesting thread.
Here is my take on "premonitions" ... and I'll spare my own accounts and experiences, and cut right to the chase:
I believe there is a difference between receiving special insight, revelation, etc from God or via some spiritual entity, verses "having your eyes and ears opened" to where you "see" and "hear" a much larger gamut of spiritual information. Let me explain.
Someone who is essentially spiritually deaf and blind, will more or less be oblivious to the spiritual realities around them. They will interact with the world around them, use their feelings, thoughts, mental capacity, etc, in order to make sense of things. When certain spiritual phenomena take place, it will remain "unexplained" and that may be the best solution they ever come to in their experience. HOWEVER ... if God wills it, or if other entities will it, that person may be used or shown information spiritually in certain instances that they otherwise would not have been privy to. They could be given knowledge, revelation, insight, etc ... in moments, but remain blind and deaf to such things otherwise the rest of the time. It would be like opening your eyes for a few moments out of your life, while the rest of the time you keep your eye lids closed. In this scenario, such a person may be ignorant as to the source of their revelation, or insight ... they may just assume it's "all God" or "all evil", or whatever their flavor of belief happens to be which colors their perspective.
Someone who has their spiritual eyes and spiritual ears open, however ... they will be open. It is not a matter of receiving insight, revelation, and knowledge here and there in scattered moments. This is a person who is seeing and hearing all manner of spiritual activity around them. Their experience is far different from other people. They will "see" and "hear" whatever is happening spiritually around them, regardless of the source. Whatever is in front of their "eyes", they will see. Whatever is "making sound", they will hear. They will basically need to learn to discern what is going on around them spiritually, to make sense of it ... much like an infant must learn to discern their own environment. All the sights, sounds, languages being spoken ... they sound like babble to the infant. They rely on other ways of discerning in order to try and make sense of their environment. But eventually, they learn the language, they learn to pick up on cues, they learn to identify what is happening to them ... before they have words for it, they learn.
The person who has their eyes and ears opened, at first is often confused ... there is so much input to discern and make sense of. Not so with the person who receives a bit here and there over the span of their life, that person views those events as special and unique ... and they are ... but by and large, their normal experience is "mere flesh" day in and out. Their feelings, thoughts, mental ability, etc, is pretty much what they have to rely on.
The person who has their eyes and ears opened, to where they "cannot be closed" ... is like a new creature, and they have an added element that others do not have. Other mechanisms to discern what is going on in their environment.
For the person of "flesh" ... who is essentially a non-spiritual person ... they must rely upon feeling, reason, etc. For various reasons, I happen to believe they can still interact with spiritual phenomena around them, they are just not able to identify it as such. It registers, but they don't EXPERIENCE it. Imaging someone being cut with a knife ... but they have no ability to feel pain. They can see the cut, see the blood, and their mind registers it as "I'm cut". But they do not feel it. They have to put forth mental effort to recognize what is happening to the. The "spiritual" person, who is "turned on all the time" ... experienced the cut. The slice. It has a distinct way their spirit experiences it. Their body still registers it ... they still feel a certain way about it, their mind tries to make sense of it, etc. But, they experience it very different from the average person.
Their experience is not bound to the way we normally experience causality ... their experience may pick up on events before they happen, for example. They may have visions, dreams, and premonitions ... that involve symbolism and analogy. This is the brain trying to make sense of the spiritual information it is picking up on, that the spirit is picking up on. It is translating it into a language that your "flesh" can understand.
In my opinion, such experiences are not that "mystical", in the sense that they are mysterious and often treated as they they are spectacular or extraordinary. In my opinion, the explanations for them are rather simple and "demystifying" them makes them easier to understand. Let me explain further ...
In my experience ... there are types of premonitions and revelations that a person can have, which are detailed and come to pass with 100% accuracy. There is little to no symbolism involved, and the manner in which they are received/seen/etc are often rather dramatic. These are often the "God spoke to me, it was clear as a bell !" experiences. In my opinion, and I'm trying not to get too controversial here, but treat this in a very basic way ... in my opinion, God does indeed know certain things before they happen and can give reliable and accurate information in advance to it happening. I know that may seem like it goes without saying, but still.
Other spiritual entities ... what people would call angels, demons, and of course humans with spirits ... their knowledge is limited, in my opinion. They know a LOT more than the average human being walking around, however, and I believe they rely upon incomplete information. Some may rely upon predictive power ... looking at odds, understanding human behavior, and making assessments based on that in order to "tell the future". For example, it's often pointed out that cold reading and psychics rely upon the Barnum effect in order to make it appear as though they have some psychic ability. Not only that, but mentalists often make use of body language and physical cues in order to "predict" certain things about people, etc. In my opinion, spiritual entities are masters at understanding the human condition, and are able to predict certain outcomes for a person from looking at their physical body in detail ... not just from the outside, but from the "inside". Things like heart right, brain activity, etc ... can all be taken into account in order to make predictions about certain scenarios and situations and how to manipulate them, etc.
Having said all of that ... the spiritual person who has "ears" and "eyes" ... sees and hears such things. They may not always be seeing and hearing what God is saying to them, they may be seeing and hearing what other spiritual entities are saying and doing in the environment. This information ... is subject to change. It is not going to come to pass in the same way that information shown by God will come to pass ... if you lean on the side that God is not a liar nor is He playing games, the premonitions and spiritual insight that come to a person, but do not come to pass or may end up fluffing out into nothing ... may not always point to an active imagination only, they may point to a spiritual person actually hearing and seeing spiritual information, it's just not of God.
An example would be: let's say you get a strong spiritual sense, that something bad is going to happen to your neighbor tomorrow if they get on some flight. You warn them, tell them ... they blow you off, and get on the flight. Nothing apparently happens. Was it just your imagination ? Are you a "false prophet" ? It's possible it was just your imagination. Or, it's possible you were picking up on "spiritual chatter" ... you were experiencing spiritual information being discussed, planned, etc ... but it wasn't of God, rather, it was other entities. And you warned the person, and they changed their mind about what they were going to do (the spirits did). Of course, if you never warned the person, perhaps they would have carried through and something bad would have happened to your neighbor. Why ? Because you didn't shine a light on their activities.
Again ... the person whose eyes and ears are functioning, they hear and see whatever is around them. They don't get to pick and choose what they hear and see. And they are not spiritually "turned off", merely waiting for God or other to give them insight and revelation ever so often. No, they see and hear whatever is around them. They may pick up on the good, and the bad.
An analogy: let's say I'm an average citizen, and I walk into an Italian restaurant one day, and overhear what appear to be some mob guys talking in the corner about some horriffic thing they are going to do the next day. Suppose they realize I heard them, and I get out of that restaurant and alert the authorities. Do you think they would still continue through with their plan ? They would most likely change their plan, or, they may do something similar and use it as a distraction, misdirection. If they know the cops will be looking for it to happen, they may use it to their advantage. Had you never said anything, then perhaps they would have merely targeted you and tried to silence you, but they would have carried through with their plan.
Some premonitions are like this ... you pick up on the "spiritual chatter" of enemy spirits, what they are planning, what they are trying to do to others around them. Pointing it out ... may make them change course, change direction. The "spiritual information" you get in such circumstances, isn't coming from God ... and demystifying it from a "it's a gift I have from God" ... makes it much more simpler: it's no more a gift than your physical eyes and ears are. No more a gift than wings on a bird that they use to fly. Spiritual people, have spiritual eyes and ears, and they hear and see things spiritually around them. You don't pick and choose what you hear and see ... which means, you will hear and see all manner of things, some of God, some aren't. Trying to make sense of and discern the information, is where people get confused, because it may take time to make sense of all the spiritual information around you. And some people are eager (for various reasons) to claim "God" on everything, and begin to think they are some superhero spiritual person with these amazing abilities, when realistically, it is BASIC. Basic spirituality ... to be able to see and hear. Making sense of WHAT you are seeing and hearing, and the source and origin and what it means, is another matter, and that takes time and experience.
Being "spiritually turned on" can apply to anyone who is, regardless of their background, culture, etc. Many people who are spiritually turned on, in my opinion, begin to think all manner of things ... they are empaths, psychics, are channeling other spirits, have angel spirit guides, are speaking with God, are God, are themselves an angel, etc. I have seen the gamut as far as what people claim. And they often begin to confuse their own imaginations and feelings with their own spiritual ability, because they get so caught up in it all. In making sense of their spiritual nature, and what they are experiencing, it may effect them any number of ways, and they may draw any number of conclusions from it. However, demystifying it, it's as simple and basic as "seeing and hearing". I could go on and on, but at this point I'll stop
As a side note, I will say I find it interesting concerning your retina detachment. That is a very specific injury you got ... interesting.
I've typed enough