I'm finding it a bit hard to type this out and explain it!

Sometimes when we lucid dream, we're unlucky in the sense that we're unable to see. We can only see dark shapes in blackness, or everything may be very faded out, or there might be nothing at all. But our dreams often, in this case, don't end right away.

When we're lucid, we sometimes close our eyes, which ends the dream in most cases. Why does purposefully losing your sight end the dream, but the dream taking your site away doesn't?