The goggles present an image that is bright enough to destroy regular night vision, therefore there is little darkness accomodation needed for goggles.
Anyone who thinks goggles are more dangerous than not having goggles is sadly mistaken. Those who think so are those who have a vested interest in the status quo, because their signature on an approval makes them responsible for actually doing their jobs - a civil agency has no panalty for failure to approve, so a NO earns no negative while a YES might actually come back to bite them.
Goggles are ALWAYS safer than not. While there is much to learn to use goggles well, there is little to learn without them, except the brace position, or how to sit in the ready room and play cards.