Final answer:
Peripheral vision, also known as sideways vision, allows us to see objects to the sides of our main field of view. It is different from visual acuity, which refers to the sharpness of focus.
Step-by-step explanation:
Peripheral vision, also known as sideways vision, is the ability to see objects that are to the sides of one's main field of view. It allows us to be aware of our surroundings without directly looking at them. Unlike central vision, which focuses on the center of our visual field, peripheral vision covers the outer edges.
This is in contrast to visual acuity, which refers to the sharpness of focus. Visual acuity is measured using tests, such as the Snellen chart, that assess our ability to see small details and read letters from a specific distance.