When practicing qigong, one becomes absorbed and the eyes fall in love as if seeing a very large area.

When practicing qigong, you fall into meditation, and your eyes seem to see a very large area.

This phenomenon is related to the frequency of brain waves when people dream. When you are y immersed in meditation, your brain waves are at a slow frequency of activity, which, like dreaming that produces images, is in a subconscious state. Your eyes seem to see a large area of the range of the place, is the range of your aura, the images outside the range of the aura can not be reflected in the brain, it will feel dark all around.

Your judgment is correct, it is the role of the sea of consciousness.