Which US President was the first to wear contact lenses?

Ronald Reagan was the first President to wear contact lenses.
http://www.presidentsgraves.com/ronald%20reagan%20fortieth%20president.htm

According to the Reagan Library:

Nearsighted since childhood. Began wearing glasses around the time he entered high school. Began wearing contact lenses when he began his acting career, which was shortly after they first became available.

https://www.reaganlibrary.gov/reagans/ronald-reagan/facts-about-ronald-reagan

Later in life, Reagan wore contact lenses. When delivering a speech he would remove one lens so he could read his notes and leave one lens in so he could see the audience. Thus, for those around Reagan it was common practice to see him re-inserting a contact lens after speaking.
http://www.doctorzebra.com/prez/g40.htm