Defocus aberration

When you look through your eyes or a camera lens, things that are far away look clear and things that are close look blurry. But sometimes, even the far away things can look blurry or fuzzy. This is because of something called defocus aberration.

Imagine looking through a piece of glass that's not quite flat, like a magnifying glass. When you look through it, everything looks distorted or off-focus. Defocus aberration happens when the shape of the lens in your eye or camera isn't quite right. It can make things look fuzzy or blurry when they should look clear.

But don't worry, there are ways to fix defocus aberration! Doctors and camera makers can use special tools and techniques to measure and adjust the shape of lenses to make sure they focus properly. So the next time you see something that looks blurry, remember that it might be because of defocus aberration, but it can be fixed!