A tincture is made (H.) from the whole plant with spirit of wine, and this proves most useful for clearing obscuration of the sight, when there is a sense, especially in the open-air, of a white vibrating mist before the eyes; and therefore it has been given with marked success in early stages of amaurotic paralysis of the retina.    From Wordnik.com.  [Herbal Simples Approved for Modern Uses of Cure] Reference