Today as so many times when I was rested and saw with my eyes closed eyes, I was curious and looked at the most holy Wikipedia and here is the answer ...

These "lights" or "points" are called phosphenes.

Phosphenes is an entoptic phenomenon characterized by the sensation of seeing bright spots, caused by mechanical stimulation, electrical or magnetic retina and visual cortex. An example of phosphine are the light patterns you see when you rub your eyes with enough pressure.


Lowenstein and Borchard in 1918 found that after electrical stimulation of visual cortex appeared phosphenes. Penfield and his research group at the 1950 confirmed the phosphenes and that electrical stimulation of certain brain areas produced pictures (phosphenes) and sounds, tactile sensations.
[Edit] Phosphenes and neural prosthetics

Brindley and Lewin at the University of Cambridge and a group of researchers from the University of Utah led by Dobelle, phosphenes thoroughly studied and established the foundations for visual prosthesis based on electrical signals injected by electrodes in the visual cortex. In 1976 the group got Dobelle length achieved blind see Braille characters using six electrodes. The reading was much faster than touch.

They were the first attempts at neural prosthetics. Today we are still not well established because there are still problems with the permanent implantation of electrodes in the brain: oxidation, inflammation of the meninges, etc.

In 2002 the Institute of Astrophysics of the Canary Islands has developed a sensory substitution program which creates a visual space sound. Let us explain: it creates a sound space that the blind can read. Consider for example that all objects are covered with bells that sound the same volume, the distance is marked by the level of that volume.

In the experience of blind people behave pretty well and are able to move around a room. The strange thing is that one of the experimental subjects have begun to see phosphenes. He begins to see the sound.