Eigengrau
I wonder how that is connected to phenomena like visual snow. Many people including me see similar effects not only in dark environments but troughout the day. Some resembling swarms of color, some seeing snow or something that resembles television static. For me there is no evenly colored surface anymore because a very faint swarm of colors washes over them.It affects my vision rather negatively and the darkness magnifies the effect immensely making it hard for me to be aware of the countours of objects.There are forums on the net were people experiment with various drugs with bizarre effects, spontaneous healing or no improvement at all were others see immediate effects.My doctor send me to the optometrist, his assistant wondered why he didn't send me to a neurologist, the optometrist dismissed it because there wasn't anything wrong with my eyes.