http://www.glassartists.org/Gal38339_make_more_realistic_eyes_tutorial.asp (http://www.glassartists.org/Gal38339_make_more_realistic_eyes_tutorial.asp)
The tutorial is also shown on this thread
http://www.lampworketc.com/forums/showthread.php?t=151357 (http://www.lampworketc.com/forums/showthread.php?t=151357)