Thank you for the questions on the HCM. Glance (also called tic eye) is the unintentional movement, usually occurs in both eyes, subcutaneous muscle spasm mi, mi earlier sphincter cartilage and the eyebrow. When muscles in the blink of an eye, the seizures can also follow, the contractions can last for a few seconds to several minutes. we may be at a glance in the following cases: when the body is tired from lack of sleep, mental stress, anemia or other eye diseases such as myopia, astigmatism, corneal inflammation ... The diseases to glance include: the human brain lesions in the brain, a neuron diseases reduced to inert or enhance stimulation by dopamine dopamine. Some forms of petit mal seizures, in patients with lesions of the nerves V, VII; or wire V, VII irritated by the corneal ulcer, uveitis, dry eye, ocular shingles; degenerative diseases such as Parkinson s neurons, Wilson syndrome; Hurricane Hysteria; by using a number of psychotropic drugs ... Prevention is by eliminating the causes glance. You need to arrange enough time to sleep 7-8 hours a day to avoid being tired eyes from lack of sleep. Eliminate or limit stressful states nervous. Be happy to help you if you need more!