In the human eye, the iris forms a diaphragm controlling the diameter of the pupil and therefore the amount of light reaching the retina1. The eye is diffraction-limited, thus by varying the pupil diameter, the iris assists in achieving maxium depth of focus, controlling light entry in bright and low-level conditions and reducing light scatter from crystallline lens abberations to maximise vision quality2. In acquired-iris defects, such as those resulting from trauma or surgical excision of iris lesions, vision quality and cosmesis can be adversely affected.
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