"Yin rises in the body, so the eye is a site that the body can throw off the yin."
This statement is absurd. YANG rises, yin descends. Period.
You can see this mechanism at work with onions. If you abstain from all oil, fat, sugar, coffee, alcohol and so forth for 24 hours and then cut onions, your eyes won't burn. The burning is a sudden discharge triggered by the strong pungent yin of the onions."
"PUNGENT YIN?" LOL. Pungent foods, like onions, are YANG foods.
Sorry to be so blunt, but the misinformation on the web is appalling at times, and the reply above is a prime example.