Final answer:
The statement about the optic disc forming a blind spot is true. The blind spots of each eye do not overlap and the brain's visual processing 'fills in' the missing information, preventing us from noticing any gap in our visual field.
Step-by-step explanation:
The statement that the optic disc forms a blind spot where the optic nerve leaves the eyeball is true. The nerve impulses from the rods and cones in the retina travel to the optic nerve via the optic disc, which is a circular area where the optic nerve connects to the retina. While this area lacks photoreceptors, thus creating a blind spot in the visual field, we do not typically experience a gap in our vision. This is because each eye gets a slightly different view, allowing the blind spots from each eye not to overlap, and our visual system fills in the blind spot in our perception.
The blind spot does not result in an observable gap in our vision for two main reasons. Firstly, the placement of the blind spots in our two eyes is such that one eye's view compensates for the other's blind spot. Secondly, our brain naturally 'fills in' the missing information in our visual field, which prevents us from noticing the blind spots under normal circumstances.