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 is a disorder that causes an individualâs muscles to contract and spasm. The condition can occur on its own (primary dystonia) or along with Parkinsonâs disease and other conditions (secondary dystonia). The result of the muscle contractions is that the body is often forced into odd and awkward movements.he condition can occur on its own (primary dystonia) or along with Parkinsonâs disease and other conditions (secondary dystonia). The result of the muscle contractions is that the body is often forced into odd and awkward movements.