I'm afraid that rather than not being possible, it's simply not advantageous for something you plan to be the perfect predator to need to reconstruct its eyes depending on what it wants to do. Let's assume it's hunting prey with sight alone: it will likely want to see ultraviolet so that it can see traces of urine and better tell a camouflaged prey from its hiding place, and infrared in case it's prey is warm-blooded to further aid in tracking it and telling it apart from the vegetation it camouflages against. It was successful and hunted it, now it wishes to hunt underwater, so it must deconstruct its eyes and rebuild them into something more adapted to underwater hunting, except it's previous eye already had traits also used to hunt underwater, such as a large pupil and high number of photoreceptors, so it's waiting both an unnecessary amount of energy and an eye structure that was already mostly fitting for the task, with the biggest matter being its ability to operate in water and the percentage of cones and rods in it.
You see, looking at a creature's eyes, how they work and how they're positioned can tell you a a few things about it, sometimes even hinting how it lives (example: creatures with forward facing eyes usually need good depth perception, and is a trait seen both in many predators as well as in some arboreal creatures which need to be able to calculate the distance between 2 branches). Going a bit away from earth biology as we know it, the potential eyes of your "perfect predator" and it's very name seems to tell me one thing: your creature is most likely a carnivorous shape-shifter, which can and will change its overall shape according to the environment it's in and what it's hunting, which is the only way I can see it being capable of giving any predator which is already highly adapted to their niche a run for their money: mimicking their millions of years worth of adaptations on the fly so that it can have a chance to outcompete them to begin with. However since it's a science-based question I'll stop approaching this scenario, as no creature over 50 cm long (because I'm not sure about certain smaller creatures) on earth, as far as I know, can actually change its entire structure on the fly and to such a degree like this hypothetical hunting machine does, with the closest to a living example being the mimic octopus (which can mimic the appearance and behavior of several creatures in its habitat on top of its camouflage abilities, but that's about the limit of how much it can "become" the creatures they mimic).
Now, putting aside how the rest of its body works and simply assuming its vision is the most important factor on whether it can hunt something or not, it still doesn't look practical, simply because we're talking earth biology here. Even if we're talking about a bioengineered creature, I still think a single pair of eyes which can change :
1- while several eyes are much more costly to maintain than 1,they also ensure you're always ready to make up for said cost. If you need to hunt a creature, whether it's in land, in water, in bright or dark conditions, it will always be ready to use the eyes it needs. Meanwhile if the single pair creature needs to leave the water to hunt on land for some reason, it will need to first adapt its eyes, which takes a good amount of time and also a good amount of energy (remember it's basically destroying the previous eye structure and forming a new one in every change), and while I can't tell exactly how costly it is or how long it'd take due to not remembering any good real life comparisons, it sounds superficially like a reasonable disadvantage for not too big of a difference in energy efficiency, especially if it needs to change its eyes often enough to have developed this ability to begin with, assuming a natural evolution approach. The only advantage I'd see here is if it was bioengineered, and simply had it but didn't use it too much that it became too costly, at which point it might have been better to just make different versions of the creature adapted to different conditions.
2- animals often don't only use their eyes to see the world. For this let me use one of my favorite animals: the vampire bat. It is considered to have good vision, especially at night, but it also has great hearing, which is good enough to both let it echolocate its way through the darkness as well as to find animals it has fed on previously simply by the prey's breathing. Once it finds the prey, it will use infrared sensors on its nose to locate blood vessels closer to the skin surface, which it will cut open and use to drink the animal's blood. In this simple example he have a naturally occurring creature using 3 different sensing organs/structures to hunt. Truth is: few creatures will rely solely on a single sense to find food or to live its life. You want eyes which can see ultraviolet and infrared? Why not leave ultraviolet to the eyes while letting the infrared to a pair of pit organs? Do you really need to have good night vision or can you make up for the lack of it with echolocation? If you can't even see your prey, why not listen for or sniff for it? Simply handling every aspect of navigation and hunting to the eyes alone sounds like a poor choice of design, and is not something we actually see often in nature, which helps demonstrate how it's not always a good idea. Even some owls, usually known for their great vision, will also rely on their ability to hear in 3 dimensions to hunt prey hiding under the snow.
Now: whether it can actually happen: I don't think a pair of eyes which can just digest and reform themselves according to the environment the creature's in are an efficient alternative, nor do I think it can occur considering earth biology alone. The closest thing from this alternative which could actually work in reality, as far as I see (ha? Haaaaa?), is to have a creature which, via a weird evolutionary history (which likely evolved an ancestor which had to live and navigate between drastically different environments) or simply via bioengineering, ended up having multiple pairs of eyes, with each pair adapted to a different environment (in your creature's case, around 3 to 4 pairs I'd say).
In regards of my vision of a perfect eye: ideally one much like the one you wanted, capable of changing according with the environment the animal's in, but on a more realistic perspective, the perfect eye is an eye which attends the needs of the creature, and which works in conjunction with other senses to form a full picture.