Sanpaku is a Japanese term that refers to a certain way your eyes look. Normally, when you look straight ahead, you should be able to see the white parts of your eyes on the top and bottom. But when you have sanpaku, it means you can see the white parts at the sides too.
Some people believe that having sanpaku eyes is a sign of bad luck or imbalance. They think it can mean you are sick, stressed, or have an unstable mind. But not everyone believes in this idea, and it's just a superstition.
In the end, whether you have sanpaku or not, there's no need to worry about it. It's just a small difference in the way your eyes look, and it doesn't actually affect your health or personality in any way.