7
Here is the map of light eyes I made from the numbers by Chamla (1940) who studied 10.500 people - around 100 people from every department in France.
The spectrum is categorized into:
1.Blue & Blue-Gray
2.Intermediate Light
3.Intermediate Dark
4.Dark
The numbers in the map are for the first two categories combined.
It likely includes gray and light green but excludes dark green and hazel.
The percentages in various departments range from 18% - 63,7%
Overall number of light eyes for entire France is 45%
Another study done on 11.000 people in 1880 gave light eyes at very similar number - 47%
A more specific map with numbers for each department:
(few departments I was unable to find - likely because they have changed since 1940)
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