Vision is an ability resulting in an active Third Eye. It allows a Magus to perceive and collect information beyond physical senses and physical planes. It could be a sensory, visual, or audial type of information. For example, we could feel pain or pleasure experienced by others. When we see a food item, we can taste it. When we look at a material, we can see its vibrations and properties.
Clairvoyance is the ability to see and correctly interpret important life events. Magus, by definition, is someone who has developed clairvoyance. In other words, you are aware of important events around you without request. A Magus will obtain knowledge in the form of visions or dreams that can foretell important events in his life or the world around him without a request. From my experience, I can see events anywhere from a few weeks to a few months ahead.
Checking for future events is different. Sometimes the system of active forces and events you are checking is very unstable, and it's not possible to see anything. Other times, the predictions are very easy because someone already made certain decisions, and they are playing out in the future; just no one knows about it yet.
Request for Information
Of course, a Magus can specifically look for a particular answer to a certain question and obtain answers with a high degree of accuracy. This rarely will be a direct answer, but rather in an allegorical way, which needs to be interpreted. This is due to the use of the subconscious mind, which doesn't have a direct connection to this world and has to rely on similar information stored in its memory. Remote viewing is also an option, and it was already proven some people can see it.
Influence on the Mental Planes and Active Subconscious
Magus has a presence in multiple dimensions. For example, if on a physical plane, he would look like an ordinary person, in the mental world, the size of the mental body or the sea consciousness is vastly larger than that of an ordinary person. It's like comparing an elephant to an ant. Also, the structure is very different. While the ordinary human has a relatively uniform structure, Magus is more like a hive due to an active subconscious mind. It's like a bus with many people inside; the most active is the consciousness of the current person, while the other riders are less active but still there. The other riders correspond to personalities of past lives.
Magus learns about past lives when working with Ajna chakra and activating the subconscious. Usually, at first, there are depictions of some high-energy events, such as death or wars. It could be landscapes of a previous life. Sometimes, a memory or insight comes in, and it seems like remembering a skill. There also could be voices in your head, where you feel precisely that it's not a mind of your consciousness but a separate person. That voice could be just one of many that are attached to your soul. Any experience that happened in any era is stored there. Most of the subconscious minds are sleeping riders on the bus; they don't have enough energy to wake up and perceive the surroundings. There could be a couple of ones that are more active. Still, they are much weaker than the conscious mind, and they can't take control. If there's a situation where the subconscious mind becomes too active to influence the person, we call it a mental health issue.
Magus receives a lot of information from the subtle world, just as a person receives information with the five senses. It allows for out-of-body experiences and travels in the subtle body into different dimensions. There are worlds and creatures that do not exist in this world, and learning them is quite a feat. It's possible to travel to the same locations every time, only to see some activity change, but the landscapes stay the same.