How eye illusion works

If you are wondering how some models’ eyes follow the camera, that’s an illusion. You might think their eyes are moving, but they aren’t.

The eyes are moved back. In this case this morph is called “恐ろしい子！”. In other models this is also called “瞳奥”, “カメラ目線” or “ｺｯﾁﾐﾝﾅ”.

This works because the white part of the eyes are concave, and the pupils kind of float in there. This won’t work if the model has convex eye.

credit: TDA Append Tranquil Miku by Xoriu, Lat式ミク