This is called the epicanthic fold, and is the reason why most Asian eyes look smaller and slanted.

这条褶皱叫做内眦，这也是为什么亚洲人的眼睛看起来更小并且上挑更明显。

The epicanthic fold itself can come in several types.

内眦本身种形态呈现。

Even strong epicanthic folds can become less-defined over time.

甚至很明显的内眦间长了也慢慢变得看不太出来。

Not to be confused with the epicanthic fold which is positioned lower and reaching the corner.

不要把盖帽眼和内眦弄混了，后者的位置更低并且接近眼角。

I seem to have a pretty weak epicanthic fold, with a relatively flat eyelid.

看起来我有很不明显的内眦和相对平坦的眼。

In actuality, the eye itself is just as big as any other race, but the epicanthic fold gives the eye a smaller, narrower appearance as well as shaping it into a slant.

其实，亚洲人眼睛本身和其它人种相比，在大小上并没有区别，只是因为内眦的遮挡，使眼睛看起来更小、更狭长，并且显得上挑。

In case you were wondering, it is possible for you to have both the epicanthic fold and the supratarsal crease, you can have one and not the other, as well as the rare case of having neither.

你也许觉得奇怪，但你可能既有内眦，也有上睑折痕，你也可能只有其中一个，也可能两者都没有，但最后这种情况比较罕见。