Eyebright is also known as Euphrasia and Ocularia because the flower somewhat resembles a bloodshot eye; that resemblance may have led ancient peoples to discover this plant's value for treating eye problems. An old French term for Eyebright was casse-lunettes, which means "break your glasses". The genus name, Euphrasia, is derived from the Greek Euphrosyne, a goddess whose name means "gladness"--in this case, referring to the gladness one felt when his/her vision was improved from using this herb. Eyebright was used in the Middle Ages as a tonic, because of its astringent properties; however, today eyebright is used more frequently for relieving eye strain, pink eye, and inflamed, irritated, or sore eyes. Eyebright's antibiotic and astringent properties tighten membranes and mucus surrounding the eyes, which effectively strengthens and improves circulation. This herb's tannins are beneficial for reducing inflammation. Eyebright also is an antioxidant herb that fights free-radical damage. Eyebright contains bitters, essential oils, several B Vitamins, and Vitamins A, C, D, and E. It also is high in iridoid glycosides, flavonoids, and tannins, and has astringent properties that may account for its usefulness as a topical treatment for inflammatory states and its ability to reduce mucous drainage. Because of its astringent properties, eyebright is sometimes recommended as an herbal treatment for relieving excess mucus and infectious conditions generally associated with sinusitis, allergies, colds and upper respiratory problems. It has recently been used for cleansing and purifying the blood, thus stimulating healthy liver functions.