Sometimes, when you close your eyes or in a dark room, your eyes will open a light show. It dances around your vision in random, psychedelic patterns and colorful flashes. Does these flash, light and color patterns indicate a physical health problem? Are they something that can be treated or cured? Or is it perfectly normal?
A common misconception about human vision is that our eyes need light to stimulate them. Even without light, neurons in our visual system are also active. The thalamus, the visual cortex and the retina are in the no-stop state, even at bedtime. The neurons in these visual systems constantly transmit signals and information. This constant activity is sometimes called background activity.
When you sleep with your eyes closed in a completely dark room, the neurons in your visual system move spontaneously, which activates other visual neurons. “Seeing the stars” is another visual effect that occurs most often when you hit your nose, laughing, sneezing, coughing, standing on the head, or standing up too quickly. Hypotension, hypoxemia, or lack of glucose are the most common causes of metabolic stimulation. Certain drugs can also produce metabolic stimulation of the visual system in varying degrees, the most effective and well-known are LSD and psilocybin.
The specific ratio of retinal axons is thicker, when the finger pressing them onto the back of the eye of the rods and cones, the people will produce phosphenes.