Summary: If you've ever rubbed your eyes and seen faint sparkles of light, you have demonstrated a surprising fact of sensory physiology. Depending on how hard you rub–and you should always be gentle–you may see glowing patches or even faint colors.
Summary: If you've ever rubbed your eyes and seen faint sparkles of light, you have demonstrated a surprising fact of sensory physiology. Depending on how hard you rub–and you should always be gentle–you may see glowing patches or even faint colors.