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The technique I devised for creating the iris is thanks in part to Ross Macintosh and Steve Newport
                , both of whom unknowingly contributed bits of technique that I was able to incorporate into my method. Begin by drawing and centering two circles to the sizes shown.    | 
        
So instead of applying a black fill and saying that will work, we'll create a subtle three color Circular Fill using the three colors shown. 
                Colors 2 and 3 will soften the outside edge of the pupil. The lighter gray will make the center of the pupil a tiny bit lighter. TIP: Having trouble dragging and dropping colors onto the fill path? You can double click on the fill path with the Fill Tool cursor to add a color station as well. 
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Create a small rectangle about one third the width of the iris and apply a two color Fractal 
                Clouds Fill. Drag the fill path arrows until they are the size and angle shown. This does a pretty fair job replicating the colored, fibrous muscles of the iris.    | 
        
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