Lower, much lower.
I exactly don´t know how many mixed people have or can have light eyes. We must have to take into account many perspectives (the degree of european admixture; the provenience of that european admixture; the degree of maintenance of light eyes in mixed people because it´s a reccesive genetic trait, more reccesive when the admixture is black than amerindian).
But in many countries, like for example Peru, Ecuador, Bolivia, Panama, Honduras, Guatemala, Dominican Republic, southern half of Mexico, I doubt that light eyes are more than a 3%.
And that´s a bunch of population.
For instance Argentina, half of their population is mostly european (+85% euro admixture), if we suppose that this population is 40% italian - 50% spanish (spanish is higher because the colonials "criollos de vuelta") - 10% northern european; and taking into account that presence of light eyes in native populations is 26% for Spain, 30% for Italy, and 70% for northern Europe.
I based myself on this map, for instance:
Making simple mathematics:
70% of the 10% of the 50% ---- 3,5% of the total population of Argentina
26% of the 50% of the 50% --- 6,5%
30% of the 40% of the 50% --- 6%
This is a favorable scenario, some of them would have lost light eyes by their minor amerindian imput.
Then, if we suppose than the other half of the population, with visible amerindian features, maintain half of the light eyes of their european provenience (mostly spanish). We obtain:
13% of the 50% --- 6,5%
The population of Argentina with light eyes could be a 22,5%.
And that´s the country with more light eyes after Uruguay (but Uruguay has a very small population in Latin American context).
The rest of Latin American countries can hardly reach 10% in any case (Brasil, Chile and Cuba mainly).
Light eyes in Latin America are less than 10%, something between 5 and 10%.
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