The yan sound

I'm confused about the sound written as 'yan' as in 眼睛。According to this page http://chinesepod.com/tools/pronunciation/section/15 the sound üan is written 'yan' and is pronounced more like the English 'yen'. But the pinyin chart makes it look as if the pinyin written as 'yan' is the 'ian' sound pronnounced 'eean', whereas the üan sound is written 'yuan'.