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.
Dystonia Dystonia is caused by the muscles not relaxing after they tighten or shorten. For people with Parkinsonâs, this is often related to the effect of levodopa. Symptoms and lifestyle Muscle cramps and dystonia P eople with Parkinsonâs often experience pain caused by muscle cramps and/or dystonia.uscle cramps and dystonia are conditions where one of your muscles or a group of muscles tighten or shorten involuntarily, causing pain.