• Part A courtesy of Thomas A. Weingeist, PhD, MD; part B courtesy of Vikram S. Brar, MD.
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    Comprehensive Ophthalmology, Cornea/External Disease

    Iris. A, Histologic section of the iris showing the sphincter muscle, typically found within 1 mm of the pupil border. The dilator muscle, derived from the anterior pigmented layer of the iris epithelium, is found in the mid iris. B, AS- OCT scan of the iris. AC = anterior chamber; Co = cornea; Ir = iris; Le = lens; Sc = sclera.