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Create a selection around the iris and right-click on that selection and select Layer via Cut.
We only need the eyeball itself so you can cut that out and delete the rest. Grab the Clone Stamp Tool (S) and clone over the iris bleeds.
I want the iris to look like it's a lens so we need to apply a new Layer Style. Double-click on the unsubtracted Shape layer and apply a Stroke effect with the following settings.
The gradient should be set to a default white-to-black gradient. It's a subtle effect but will add to the realism later on.
Create another Shape layer with the same techniques used in step 7 and design something similar as shown below.
This is where we are going add the cool glow effect to the iris but first, create two copies and put them below the layer we're working on but disable the Layer Visibility for now. Double-click on the right to make the Layer Style menu appear and check Outer Glow with the following settings applied.
Select one of the copied layers and enable the Layer Visibility again. Right-click and convert this Shape layer to a Smart Object and go to Filter > Blur > Gaussian Blur and set it to 40 pixels.
Repeat this exact same step for the other copied Shape layer only this time, set the Gaussian Blur at 10 pixels.
The eye could use some glare so grab a big soft round brush, create a new layer, and click just once. You may adjust the Opacity to whatever you want.
Create a copy of that glare layer and press Ctrl + T to resize, rotate it and place as shown below.
If you have followed this tutorial properly, you should know that this is the time to mask the area of the newly create high-tech eye. Select your Eyeball folder, add a Layer Mask and simply remove the area on top of the eyeball.
We're almost finished but we still need to apply some more color correction. Create a Solid Color layer, set the color to #7D7D7D, and set the Blending Mode to Overlay. Place this layer on top of all layers and convert this to a Smart Object. Go to Filter > Noise > Add Noise and apply these settings.