Section 10. Licenses to adult blind persons

The mayor of any city shall
  have the power to issue a license to any  adult  blind  person  for  the
  vending  of  goods, or newspapers in such places as he may set aside for
  this purpose. The license shall be issued for a term of one year and  no
  charge shall be made for the license. A license shall not be issued to a
  blind  person unless he or she is a resident for three years in the city
  in which application for such license is made and is a  citizen  of  the
  United  States  or an alien lawfully admitted for permanent residence in
  the United States.
    This license shall be revocable only for cause.