Eyebright

Euphrasia officinalis

Physical Characteristics

Euphrasia officinalis is a ANNUAL growing to 0.2 m (0ft 8in) by 0.1 m (0ft 4in). See above for USDA hardiness. It is hardy to UK zone 6. It is in flower from July to September. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees. The plant is self-fertile. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils and can grow in very alkaline soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

Distribution

W. Europe, including Britain, to E. Asia.

Habitats

Lawn; Meadow;

Edible Uses

Edible Parts: Leaves Edible Uses: Leaves - raw[7]. They are occasionally used in salads for their slightly bitter flavour[7].

Medicinal Uses

Antiinflammatory Astringent Digestive Homeopathy Ophthalmic Tonic Eyebright has a long history of herbal use in the treatment of eye problems and is still in current herbal use[4]. It is important that only the correct forms of eyebright, with glandular hairs on the calyx, are used, since other forms do not possess medicinal virtues[268]. Eyebright tightens the mucous membranes of the eye and appears to relieve the inflammation of conjunctivitis and blepharitis[254]. Its ability to counter catarrh means that it is often used for infectious and allergic conditions affecting the eyes, middle ear, sinuses and nasal passages[254]. The whole plant is anti-inflammatory, astringent, digestive, ophthalmic and slightly tonic[[4, 7, 9, 14, 165, 220]. It is taken internally in the treatment of catarrh, sinusitis, hay fever, upper respiratory tract infections etc[238]. As an ophthalmic, an infusion of the plant can be taken internally or used as an eye wash. Alternatively, the diluted juice can be dropped into the eyes[232]. Some caution should be exercised, experimentally it can induce side effects including dim vision[222]. The plant's astringency makes it inappropriate for treating dry or stuffy congestion[254]. The plant can be used externally as a poultice to aid the healing of wounds[268]. Eyebright should be harvested when in flower and can be dried for later use[238]. The dried herb is a ingredient of herbal smoking mixtures, used in the treatment of chronic bronchial colds[4]. A homeopathic remedy is made from the expressed juice of the plant[232]. It is used particularly in the treatment of eye inflammations and colds[7, 232].

Known Hazards

Use for eye conditions currently not recommended. Adverse effects include: mental confusion, headaches, eye pressure, redness and swelling of the eye if 10-60 lotion drops used. Eye symptoms possibly followed by sensitivity to light, sneezing, nausea, constipation, cough, shortness of breath and increased passing of urine [301].