A good example of this is when you’re looking at semi reflective glass windows, you can focus on the reflection you’re obviously seeing but the actual glass characteristics can be a little blurry, but then you can change your focus and the reflection becomes blurry but now you can see the glass characteristics such scratches on the surface for example.
How does the human eye do that?
In: Biology
Glass is an interesting example, let’s back up.
Your eyes focus on a specific distance, say 2 feet in front of your face, or 20 feet in front of your face. Muscles in your eye pull and bend a lens in the front of your eye which bends the light entering your eye and projects it on special cells in the rear of your eyeball which “see” the image being focused. A subconscious process in the brain triggers the muscles to bend the lens so that the image being projected is in focus.
Glass is tricky because it’s partially see through. Are you looking through the glass and out the window? In that case your eyes might be focusing 30 feet away to the deer that are eating your goddamn azaleas *again.* But you can also make your eyes refocus on the actual pane of glass in front of you, now you’re seeing the details on the surface of the glass itself.
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