Is the iris a perfect circle?
Is the iris a perfect circle? Even a healthy iris is rarely PERFECTLY round when viewed close up. A healthy iris will 'average' to round but the tissues that make it up have some texture of their own. Does the iris change shape? The edge of the pupil may turn outward (ectropion uveae). The onset of this disorder is gradual, and the changes in the shape and placement of the pupil are usually noticed before any change in vision occurs. Degeneration and holes in the iris may develop over a period of several years. Why do irises have color? The...