Comment by userulluipeste
4 years ago
"Correlation does not imply having something to do with another."
By its very definition, "correlation" means exactly "a mutual relation": https://www.dictionary.com/browse/correlation The example you're giving is called coincidence not correlation. There are times where words' etymologies loose their connection with their current meaning, but that is not the case here, where we have "con" meaning "together" + "relation", which is a logical construction agreeing with word's meaning.
In the context of scientific research on myopia, we're pretty clearly talking about definition #3, not definition #1:
> Statistics. the degree to which two or more attributes or measurements on the same group of elements show a tendency to vary together.