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
Do you know how the glass of magnifying glasses is curved? A round curved glass like this is called a lens, and we have the same thing inside our eyes – but better!
The lens inside our eye, right behind the center black dot, is very soft and malleable. It is attached by tiny strings of muscles which can pull it back and forth in order to stretch the lens or make it looser. That way, the lens can change shape (its curvature) to make sure your focus is always best for the distance you are looking at! It’s pretty neat.
(Note, this system doesn’t work if you focus on anything further than about 10-12 meters. Beyond this point, the muscles stretching the lens are completely relaxed and can’t loosen further.)
Latest Answers