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Essa correção funcionou para mim.
I did some more digging on this and it turns out it has something to do with how OSX renders fonts for certain LCD monitors. I was experiencing this with my MacBook Air when attached to a Samsung LCD monitor. However, there was no issue when just using the Macbook Air on it's own or with my Apple Cinema Display.
Here is what I did to fix it. Run the following code in Terminal:
defaults -currentHost write -globalDomain AppleFontSmoothing -int 2
Then restart your system. Once OSX booted up again, the problem was gone. You can read more about this here: