That's a kind of common misconception. Nothing collapses. Measurement system (e.g. your eye) just gets entangled with particle in the same way particles get entangled to each other, in a particular state.
Well, the question of measurement in QM is somewhat deep one, and no theory should be dismissed off-hand. The notion of "collapse", in particular, can be seen as expressing the non-unitarity that is intrinsic to considering measurement as a non-reversible process (which means that it there's too many things that get entangled with the particle - not just the eye but also systems in your brain, for example, so that the process becomes effectively irreversible; one can also say that the process that has lead to creating information cannot be undone).
I thought that unitarity was also preserved in quantum mechanics, which is linked to the law of preservation of information , which induces reversibility. This was the central question about black holes destroying information being a problem, which gives rise to the problem of black hole firewalls. If information is truly destroyed, then quantum mechanics has a deep flaw
Even if information can be destroyed ("erased"), it is not by way of reversing the process that lead to its creation, the latter thus being necessarily non-unitary. This, in fact, is a requisite for the notion of measurement to make any sense.
The point here is to consider what the claimed "non-reversible process" means in a quantum theory that as of current does _not_ allow for destruction of information.
