Iris
The circular, colored curtain of the eye. The opening of the iris forms the pupil. The iris helps regulate the amount of light that enters the eye.
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- Iris, speckled
Due to little white (or lightly colored) spots that are slightly elevated on the surface of the iris. These spots, arranged in a ring concentric with the pupil, occur normally, but more frequently, in Down syndrome (trisomy 21). They were described in 1924 by Thomas Brushfield, are called Brushfield’s spots, and are due to aggregation […]
- Iritis
Inflammation of the interior eye structures.
- Iron
An essential mineral. Iron is necessary for the transport of oxygen (via hemoglobin in red blood cells) and for oxidation by cells (via cytochrome). Deficiency of iron is a common cause of anemia. Food sources of iron include meat, poultry, eggs, vegetables and cereals (especially those fortified with iron). According to the National Academy of […]
- Iron deficiency anemia
A common form of nutritional disorder, iron deficiency results in anemia as iron is necessary to make hemoglobin, key molecule in red blood cells responsible for the transport of oxygen. In iron deficiency anemia, the red cells appear abnormal and are unusually small (microcytic) and pale (hypochromic). The pallor of the red cells reflects their […]
- Iron excess
People with certain genetic conditions such as hemochromatosis; and People receiving repeated blood transfusions. According to the National Academy of Sciences, the Recommended Dietary Allowances of iron for women ages 19 to 50 is 18 milligrams per day and for men ages 19+, 8 milligrams per day.