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Eyebright (Euphrasia) was used for eye conditions. The markings on the petals look like an eye.
The most common flower colors are purple, blue-white, and violet. Some species have yellow markings on the lower petal to act as a guide to pollinating insects.
Nicholas Culpeper assigned it to the Zodiac sign Leo, claiming that it strengthened the brain. It was also used to treat bad memory and vertigo.
In the Elizabethan era the plant was used in ales and Gervase Markham's Countrie Farm (1616) recommended that one should "Drink every morning a small draught of Eyebright wine.