When reading about the basics of photography and the physics involved, I learned about depth of field. Long story short, the message is that with a smaller aperture, the length of the depth of field increases. For a wide-open aperture one gets a smooth bokeh for example.
The human eye does have an aperture as well (the iris). But I never noticed seeing any different with respect to depth of field no matter if it was a darker (wider iris) or brighter (narrow iris) environment.
Why is this difference presumably not as pronounced as it is for photography? Or am I mistaken?