Eye colors depend on the amount of pigment (melanin) found in the iris and how it is distributed. Light gray-blue eyes contain much less pigment than extremely dark brown eyes. And there are many shades of eye color in between. SEE ALSO: What Determines Hazel Eye Color >.
Dystonia is a movement disorder in which a person's muscles contract uncontrollably. The contraction causes the affected body part to twist involuntarily, resulting in repetitive movements or abnormal postures. Dystonia can affect one muscle, a muscle group, or the entire body.ystonia can affect different body parts, and often the symptoms of dystonia progress through stages. Some early symptoms include: 1  A dragging leg. 2  Cramping of the foot. 3  Involuntary pulling of the neck. 4  Uncontrollable blinking.
Laryngeal dystonia is a type of focal dystonia that causes the muscles of the voice box (larynx) to spasm. Your voice can either sound strangled or very quiet and breathy, depending on whether the muscles of your larynx spasm outwards or inwards.opa-responsive dystonia. Dopa-responsive dystonia is a type of generalised dystonia. The symptoms of this type of dystonia usually begin during childhood, between the ages of 6 and 16 years. The most common symptom is an abnormal, stiff way of walking.