The algorithms used are pretty robust - your typical iris scan won't be done with a fully opened eye and there's also the question of eyelashes. Some examples:

The algorithms used are pretty robust - your typical iris scan won't be done with a fully opened eye and there's also the question of eyelashes. Some examples: https://www.researchgate.net/figure/The-outline-boundaries-show-results-of-the-iris-and-pupil-localization_fig2_339570046 https://www.researchgate.net/figure/The-outline-boundaries-s...