HERE IS THE ANSWER...................................................................................................................................

A "blind man" is a man who makes/installs/sells "blinds." 

These things below: 

http://theblindmancharlotte.com/blinds/index.html

So, because this person is just a normal guy who installs blinds, there is no reason to presume that he is unable to distinguish which pills are red and which are blue. Thus, each day he simply takes one of each.

Congratulations Mikkel, Katarina, Wanda and Roy for your great hints.

Thank you all for commenting on this thread.

I will come up with another one very soon.

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...one red pill and one blue pill per day for two days or he will die.

One week later he is still alive.

How did he do it?

P.S. This question will probably seem very simple and obvious to native English speakers.

So, if you are a native English speaker and know the answer, please just say " yes, I know the answer"

Tomorrow, I'm revealing the right answer.