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
The lens in our eye can change shape!
Focus is all about focal distance. The light reflected off an object passes through a lens, that focuses that light on a single point. If that point is on the receptors then the image is clear – if it isn’t, the image is blurry.
Since objects are different distances away, focal distance changes for each object. Cameras solve this problem by physically moving the lens forward and backwards to change the focal distance. Our eyes use a different trick – there are small mussels around the lens that push and pull on it, changing how the lens bends the light and thus changing the focal distance.
When we focus on a specific object, our brain automatically tells the mussels in the eye to change the shape of the lens until it gets a clear image.
Latest Answers