Why is there no blind spot where the retina connects to optic nerve?

The optic disc, where the optic nerve connects to the retina, does in fact have a blind spot. This area of the visual field is also known as the optic disc or optic nerve head, and it is where the optic nerve fibers exit the eye. Because there are no photoreceptor cells (cones or rods) in the optic disc, it does not detect light. As a result, there are a few small spots in the world that a person with normal sight cannot perceive directly, but this goes unnoticed because the brain compensates for the blind spots by filling them with information from the surrounding areas.

Most people are not consciously aware of their blind spot because the brain compensates for the lack of information from that area. The brain uses information from the surrounding area to fill in the gaps, so we do not notice the absence of visual input from the blind spot. However, the blind spot can be easily demonstrated by closing one eye and focusing on a small object in front of the open eye. If you slowly move your head to the left or right, the object will disappear at a certain point, and reappear when you move your head back.