a person who studies or is an expert in natural history, especially a zoologist or botanist. an adherent of naturalism in literature or art.
Causes. Occipital neuralgia happens when thereâs pressure or irritation to your occipital nerves, maybe because of an injury, tight muscles that entrap the nerves, or inflammation. Many times, doctors canât find a cause for it. Some medical conditions are linked to it, including: Trauma to the back of the head; Neck tension or tight neck muscles
They are also called retinal migraine, eye migraine or ophthalmic migraines. Ocular migraines are caused by a sudden tightening (or constriction) of blood vessels, which reduces blood flow to the eye. Most last under five minutes.Afterwards, vision usually returns to normal.ermanent vision loss is quite rare. Ocular migraines may be more common in. 1  Women. 2  People under 40 years old. 3  People who have a personal or family history of migraines or other headaches. 4  People who have diseases such as lupus, hardening of the arteries, sickle cell disease, epilepsy or depression.