When you blink your right eye see a circle like the back of what is this?

When you blink your right eye and see a circle like the back of something, you are most likely seeing the optic disc, also known as the blind spot. The optic disc is the area of the retina where the optic nerve leaves the eye. It is devoid of photoreceptor cells, which are responsible for converting light into electrical signals. As a result, the optic disc appears as a small, dark circle when you look at it.