Iris and retina: fully genetically determined?

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In summary, the conversation discusses two biometric techniques, iris recognition and retinal scan, and whether the patterns in these techniques are the same in identical twins. After further research, it is concluded that these patterns are not the same in identical twins, indicating that they are not completely genetically determined. The conversation also mentions a video about unique fingerprints and how similar mechanisms may affect the growth of eyes.
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nomadreid

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TL;DR Summary
The capillary arrangement in the retina that is used for the retina identification scans, and the pattern of the iris used for iris identification scan: apart from disorders, are they determined at least partly by the environment (say, in the womb, like fingerprints) or fully determined by genetics (like eye colour)?
I am posing two questions, one for each of two biometric techniques
https://en.wikipedia.org/wiki/Iris_recognition
https://en.wikipedia.org/wiki/Retinal_scan
Attempting to find the answer to the question posed in the Summary, I only get articles about hereditary eye disorders.
I am referring to the normal cases... obviously either one of these may be altered by a disorder or disease or an accident.
 
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Are these patterns the same in identical twins?
I suspect not.
If not, they are not completely genetically determined since identical twins have the same genetics.
 
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Watch this brief and delightful video from MinuteEarth to learn more about what makes your fingerprints unique. It is reasonable to believe that similar mechanisms would affect the way your eyes grow.
Looking again at your first post, you've probably seen it.
 
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