Seeing is a natural object to be aware of because it is so obvious.
The only thing that people find difficult is that when we try to recognize seeing, it has become a habit to immediately look and see objects outside of ourselves. It is difficult to recognize the process of the eyes and the mind just doing this work of seeing.
Our whole life, we have used our eyes to actually know the concepts of the world – the distance, size, shape, color, and so on of things around us. That recognition comes is really quickly.
To understand that it’s just a process of seeing and not have to go into the names of the things we see, some people find it difficult to switch to just that.
It’s practice as well – if anyone practices, they become more familiar and understand it more easily.