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I'm not sure where this thread belongs; it is essentially a topic at the intersection between quantum optics, human physiology and even psychology, but I will focus more or less on the implications for quantum physics, so I just opted for this subforum.

There is a recent article over Scientific American titled The Human Eye Could Help Test Quantum Mechanics. It is an intriguing piece based on a recent arxiv preprint:

Holmes et al. 2018, Testing the limits of human vision with quantum states of light: past, present, and future experiments
Abstract said:
The human eye contains millions of rod photoreceptor cells, and each one is a single-photon detector. Whether people can actually see a single photon, which requires the rod signal to propagate through the rest of the noisy visual system and be perceived in the brain, has been the subject of research for nearly 100 years. Early experiments hinted that people could see just a few photons, but classical light sources are poor tools for answering these questions. Single-photon sources have opened up a new area of vision research, providing the best evidence yet that humans can indeed see single photons, and could even be used to test quantum effects through the visual system. We discuss our program to study the lower limits of human vision with a heralded single-photon source based on spontaneous parametric downconversion, and present two proposed experiments to explore quantum effects through the visual system: testing the perception of superposition states, and using a human observer as a detector in a Bell test.
The newer experimental evidence that the preprint refers to is described by another article over at Nature titled: People can sense single photons:
Opening piece said:
Experiment suggests that humans are capable of perceiving even the feeblest flash of light.

People can detect flashes of light as feeble as a single photon, an experiment has demonstrated — a finding that seems to conclude a 70-year quest to test the limits of human vision.

The study, published in Nature Communications on 19 July, “finally answers a long-standing question about whether humans can see single photons — they can!” says Paul Kwiat, a quantum optics researcher at the University of Illinois at Urbana–Champaign. The techniques used in the study also open up ways of testing how quantum properties — such as the ability of photons to be in two places at the same time — affect biology, he adds.

“The most amazing thing is that it’s not like seeing light. It’s almost a feeling, at the threshold of imagination,” says Alipasha Vaziri, a physicist at the Rockefeller University in New York City, who led the work and tried out the experience himself.
These ideas indeed go back a century to Poincaré (in The Foundations of Science), and later to Feynman (in his Lectures), who both spoke extensively on this subject, as well as to many others since.

In any case, it is absolutely intriguing to think to what extent such research might help on shedding some much needed light on problems in the foundations of QM; the capability of replacing a measuring apparatus directly with a human being would surely be a paradigmatic shift in QM research. It goes without saying that it would be absolutely unbelievable if such research could end up resolving the measurement problem in QM.
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