Vision refers to the sense of sight, allowing us to perceive and interpret the world around us through our eyes. It involves the process of light entering our eyes, being focused by the lens onto the retina, and then converted into neural signals that are sent to the brain for interpretation.
The retina is the innermost layer at the back of our eye that contains specialized cells called photoreceptors (rods and cones) which convert light into electrical signals.
The blind spot is an area on each retina where there are no photoreceptor cells present. This occurs because this region is where the optic nerve exits the eye, so it lacks receptors for detecting light.