Mother Nature eye is made of three primitive they are together.
If you want the eye to be big or small please separate them by holding down one of the parts then move it out of the group.
3d head is use for example of the eye and eyelashes primitive down below.
If you want the eye to wink or blink you can duplicate the top and bottom eyelashes.
They won’t be together when duplicate please hold down one of the primitive then move it to another they will group together and can be move around together.
Example is down below.