Peripheral vision is a part of vision that occurs outside the very center of gaze. There is a broad set of non-central points in the field of view that is included in the notion of peripheral vision. “Far peripheral” vision exists at the edges of the field of view, “mid-peripheral” vision exists in the middle of the field of view, and “near-peripheral”, sometimes referred to as “para-central” vision, exists adjacent to the center of gaze.
The loss of peripheral vision while retaining central vision is known as tunnel vision, and the loss of central vision while retaining peripheral vision is known as central scotoma.
Peripheral vision is weaker in humans, compared with other animals, especially at distinguishing color and shape. This is because receptor cells on the retina are greater at the center and lowest at the edges (see visual system for an explanation of these concepts). In addition, there are two types of receptor cells, rod cells and cone cells; rod cells are unable to distinguish color and are predominant at the periphery, while cone cells are concentrated mostly in the center of the retina, the fovea.
TEST YOUR PERIPHERAL VISION NOW:
– Pay attention to the picture below: