-Create a new document with a transparent background that is 400 px by 400 px
-Duplicate the background layer and fill with white
-Use Filter -> Noise -> Add Noise and use 400% Gaussian (do not check Monochromatic)
-Use Filter -> Stylize -> Extrude and use Type:Pyramids Size:2 Depth:40 Random (do not check Mask Incomplete Blocks)
-Duplicate this layer
-On the duplicate, use Filter -> Blur -> Radial Blur and use Amount:12 Blur Method:Spin Quality:Best
-Set Layer to Darken
-Link this layer with the prior one and use Layer -> Merge Linked
-Use Image -> Adjustments -> Color Balance to color (i.e., for a green iris, I used Shadows:0,+25,+15 Midtones:0,+50,+25 Highlights:0,+30,+20)
-Use the Eliptical Marquee slection tool and set it to Style:Fixed Size Width:300 px Height:300 px and make at selection centered in the image (X:50 Y:50)
-Use Select -> Inverse and then hit the Delete Key
-Use the Eliptical Marquee slection tool and set it to Style:Fixed Size Width:160 px Height:160 px and make at selection centered in the image (X:120 Y:120)
-*Use Select -> Feather and use Feather Radius:2 and then hit the Delete Key
-While maintaining the current selection, create a new layer and paint the selection black
-Link this layer with the prior one and use Layer -> Merge Linked
-Use Filter -> Render -> Lens Flare and use Brightness:50 Lens Type:105mm Prime and move the center where the Iris and Pupil meet where you would like (i.e., between 10 and 11 o'clock)
-Use Filter -> Render -> Lighting Effects and use a white spotlight. Put the center at the center of the pupil, and the other end of the radial line through the Lens Flare center and out about another 300 px or so. Pull the width of the elipse out unitl the effect looks right.
*The intent is to put this on a white/light background (there is some transparency between the iris and pupil). If this is a problem, skip the feathering in this step.
