JS - Eye follows mouse

script.js

$( document ).on( "mousemove", function( event ) {
    var mousePosition = {};
    mousePosition.x = event.pageX;
    mousePosition.y = event.pageY;
    $(".eye").each(function(index,element){
        eyePosition = $(this).offset();
        angle = Math.atan2(mousePosition.y - eyePosition.top, mousePosition.x - eyePosition.left);
        translateX = 10 * Math.cos(angle);
        translateY = 10 * Math.sin(angle);
        $(this).attr("transform", "translate("+ translateX +" "+ translateY+")");
        });
});