Several causes can cause conjunctivitis. Conjunctivitis is most often caused by viruses, a bacterial infection or an allergy. The lenses, the sun can also be the cause of inflammation of the conjunctivitis and sometimes even the cornea.
Here are some examples of causes of conjunctivitis ...
> Viral conjunctivitis is the most common infection of the conjunctiva.
> Bacterial conjunctivitis can be the complication of a viral infection or related to the presence of a foreign body.
> Allergic conjunctivitis is not contagious. Many products can cause conjunctival allergy. Environmental allergens: dust, pollen, cats, make-up products, cleaning products, lenses, eye drops containing preservatives, or other additives. This type of conjunctivitis occurs more often on "atopic terrain" (that is to say in a person suffering from allergic problems: hay fever, eczema, asthma ...).
> The ophthalmia of the snow is a keratoconjunctivitis. It is due to the very strong reverberation of UV at altitude and on snow. In the end, the conjunctiva and the cornea are altered. Ophthalmia can be serious and lead to vision problems afterwards. We must think at all costs to avoid it by putting on good sunglasses when skiing or hiking in the mountains in the snow.
Caution, conjunctivitis may have another specific origin that requires special treatment and monitoring (such as infection with the herpes virus).