Clear lenses are designed specifically for night skiing. Since they have no tint at all, they let in maximum light without altering colors, giving you the clearest possible vision under floodlights or lampposts. If you regularly ski at night, they're essential—any tint would darken your view when you need all the light you can get.
For daytime skiing, clear lenses aren't a good choice. They don't reduce brightness, enhance contrast, or cut glare, so you'd be squinting and struggling to read terrain in sunlight. They also won't help in flat light or overcast daytime conditions the way a rose or amber tint would.
If you only ski during the day, skip clear lenses entirely. But if you're a night skier, they're worth having—either as a dedicated night goggle or as a spare lens you can swap in when the lights come on. Some goggles come with interchangeable lens systems that make this switch quick and easy.