I'd stay away from a motorcycle helmet, as they are significantly larger, and more importantly, several times heavier than a bicycle helmet. They are also, as noted, severely lacking in ventilation that works at bicycle speeds.
I've worn a lot of full-face motorcycle helmets over the years, and I've never noticed a 'severe restriction in vision' but what you do give up is hearing acuity. Motos are loud, so moto helmets provide some degree of hearing protection; on a bicycle, unrestricted hearing is a lot more important.
user1617 If you really want to explore the full-face route, without the "X-treme" look of a BMX/DH helmet, then whitewater kayak helmets might be an option to explore.
Similar in construction / protection to a bicycle helmet, but without as agressive of a look.
https://coloradokayak.com/products/2...gn=sag_organic
