The following article claims that it might be possible to develop eye drops for humans that double night vision capacity and enable humans to see some of the red light spectrum that is normally invisible to humans in low light conditions. The research came from studying fish which can see the red end of the light spectrum.
This has two implications for sasquatch research. Will field researchers someday be able to use this enhancement while doing research at night, and secondly, does this have any implication on whether sasquatches can see IR light. It might not, but many believe they can see it. Fish and reptiles can see the red end of the light spectrum, but most all mammals cannot see the red end of the light spectrum, with primates (including Humans) being the exception. I still wonder if sasquatch night vision includes it being able to see further into the IR range than humans can. No other mammal that has night vision has cones that can see IR, but sasquatches being from the primate linage can.