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Night Vision Goggles for Google Cardboard
That's cool. I mainly made the app for people like you who would want to attempt that mod, but I put "simulated" in the description due to the amount of people who think just an app can somehow actually give their phone night vision. I did add an IR enhanced option, though, that better maps the frequency response of a phones camera to the green screen effect.
IPhones, I believe, have a much better IR filter. Meaning they can take better photos, but aren't as good at seeing infrared. You could try the front camera and see if it works any better, since they aren't usually filtered as much. This is generally the case for Android, I'm not sure about iPhone though.
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