面相里的所谓三白眼四白眼是指什么样的眼?最好有图片.

文：
http://www.douban.com/group/topic/1289451/
图：
http://images.google.cn/imgres?imgurl=http://www.medi-life.com.tw/ImageResizeCache/4d5ade6ad4c7ac3c2ee39304b6e3c78f.jpg&imgrefurl=http://www.medi-life.com.tw/Articles.asp%3FBlockName%3DArtCon%26VS%3D8%26AT_ID%3D22&h=225&w=300&sz=48&hl=zh-CN&start=13&um=1&usg=__bJ84g_naJo18zGrAI0BOGcJUedA=&tbnid=nlLqSsBDNweCXM:&tbnh=87&tbnw=116&prev=/images%3Fq%3D%25E4%25B8%2589%25E7%2599%25BD%25E7%259C%25BC%26um%3D1%26complete%3D1%26hl%3Dzh-CN%26lr%3Dlang_zh-CN%26newwindow%3D1%26sa%3DN
图：
http://image.baidu.com/i?tn=baiduimage&ct=201326592&lm=-1&cl=2&fm=ps&word=%CB%C4%B0%D7%D1%DB