Ah, I see. In my comment I was discussing wearing the colour red (red colouration suggesting social dominance/arousal, and is cross-cultural), hence quoting the methodology of that study (you can modify one variable only, by digitally manipulating only clothing colour).
I don’t think blue eyes are more attractive than all the other eye colours. There is an observed preference for similar coloured eyes in blue eyed men (no other sex or colour combo). There may be an alternative explanation, but for now the theory is it’s because blue eyes are recessive, so it’s parentage assurance related for men. It’s an, on average, physical preference, but not beauty related as such.
All the advice is facetious. I’m definitely not wearing blue contacts myself! The title “brown eyes, blue eyes” is a nod to an experiment critical of humans’ tendency for divisiveness/assuming their own group is somehow better than others. I don’t believe being attractive is particularly important, especially not according to one cookie-cutter standard of beauty. I hope that helps clarify, satire often walks a fine (but this has been tagged and curated in humour).