The phenomenon of seeing your own nose is a normal occurrence and is a result of the way our visual system works.
Our vision is not limited to just what we perceive as the main view. It also includes our peripheral vision, which provides us with a broader awareness of our surroundings. Our nose is located right in the center of our face, and it is always present in our field of vision, but our brain usually filters it out and ignores it to focus on the more important parts of our visual scene.
However, in certain situations, such as when you are looking at something up close or in a well-lit environment, your nose becomes more noticeable. This is because the brain is not actively ignoring it in those moments, and it falls within your visual attention. It's similar to how you might become aware of your breathing or other bodily sensations when you focus on them.
In everyday life, our brain usually prioritizes the more significant visual elements in our environment, and our nose becomes less noticeable. So, most of the time, you don't actively notice your nose in your visual field. However, when you deliberately pay attention to it or when there are certain visual conditions that make it more prominent, you'll become more aware of it.
Remember, seeing your nose in your peripheral vision is a normal and natural part of how our eyes and brain process visual information, and it is not a cause for concern.