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[–] MinorLeakage 0 points 3 points (+3|-0) ago 

I'm not exactly sure, as I'm no expert. But I think your doctor was maybe explaining how he would mimic the coloration?

Here's a decent article on wikipedia (they can still okay for non-political subjects...) that actually disproves some of what I said earlier. But it does agree with (most) of what I said about blue eyes, in that it's structural, not pigmentation. The only pigment human eyes use is melanin, which ranges in color from brown to black depending on some other factors.

The appearance of blue and green, as well as hazel eyes, results from the Tyndall scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky called Rayleigh scattering.[5] Neither blue nor green pigments are ever present in the human iris or ocular fluid.[3][6] Eye color is thus an instance of structural color and varies depending on the lighting conditions, especially for lighter-colored eyes.

https://en.wikipedia.org/wiki/Eye_color

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[–] cyclops1771 0 points 2 points (+2|-0) ago 

I found this, too:

In a brown eye, a thin layer of brown pigment covers the anterior iris, preventing light creating an opaque brown iris; in a blue eye, the Strōma fibers of the iris scatter incoming white light, creating a translucent, blue-gray appearance.

He must have been referring to the artist process.