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No. Definitely the trends change, however 4 generations is not enough to have a major impact. Hryncewicz did not make any use of scales, limiting the value of his study. Particularly direct comparisons with findings of other authors are not possible. However, if you carefully compare the percentages to those from other sources (like Coon), you should see that the trends stay basically the same. The only difference is that Hryncewicz underestimated the green or mixed-eyes category, classifying the border shades as grey and brown.
However, that is because he used "common sense" instead of a set of glass eyeballs. When I conducted a search on a Polish dating website, I found that green eye freq. was approx. 20%. This is much lower than the total of 28-29% (data from the 50s) for all Martin's 7-10 shades in Poland. One may argue that it's due to real changes in the population, but for the reasons I mentioned before, I would rather put it down to the conflict between common sense observations and use of Martin scale. Particularly classyfing hazel and brown-green shades with preponderance of brown as simply "brown", seems to be the reason behind the discrepancy...
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