When tired, what happens to your peripheral vision?

When you are tired, your peripheral vision tends to shrink. This phenomenon occurs because fatigue can impact your overall alertness and ability to process visual information. When you are well-rested, your brain is more efficient at taking in and interpreting signals from your surroundings, leading to a broader field of vision. However, as fatigue sets in, your attention and processing capabilities diminish, which can cause a reduction in the effectiveness of your peripheral vision. This means you may have a harder time noticing objects and movements outside your direct line of sight, making it important to be particularly cautious while driving or performing tasks that require alertness when you are feeling tired.