Vivo Y83 Pro has the same aperture of f/2.0 on both sides of cameras.
Yes, Vivo Y83 Pro does have the OTG support.
Yes, Vivo Y83 Pro comes with the earphone in the box. The other accessories include - power adapter, USB cable, protective case, sim ejector tool and quick start guide.
Yes, Vivo Y83 Pro does have the eye protection mode.
No. Vivo Y83 Pro does not have the NFC support.