Questions about Colon Cleansing?

Does colon cleansing really work? I know it flushes/cleans the colon, but ive heard it also flushes/cleans other parts of the body as well (considering everything in your body are connected) like ive read a blog of a woman that claims that the Master Cleanse actually rid her of he eye floaters. do colon cleansers flush the eyes too? is there a certain age u should be for a colon cleanser? thanks.