Your daily use Bifocals are unlikely to help you. I use multifocals normally, and they are worse than useless with the
goggles. You will likely need off the shelf readers of the correct diopter strength (big hassle changing glasses though), or preferably corrective lenses which attach to the
goggles so that you do not need glasses at all while using the
goggles. Made by DJI or other aftermarket suppliers. I'm still waiting for mine to arrive. Plenty of info on here on this subject if you search for it. To use the
goggles without any form of corrective lenses, you need to be able to focus at about 9-11 inches without glasses. I don't think many far sighted older folks can do this.