There is created the South Carolina Commission for the Blind. The commission shall consist of seven members, one from each of the seven congressional districts, of whom three shall meet the legal definition of blindness as defined in § 43-25-20. The Governor shall, with the advice and consent of the Senate, appoint the members of the commission for terms of four years and until their successors are appointed and qualify. All vacancies must be filled in the manner of the original appointment for the unexpired portion of the term only. The members of the commission shall elect one of its members as chairman for a term of two years or until his successor has been elected. The chairman shall preside at the regular meetings of the commission to be held at least once each year. The chairman may call a meeting when he considers it necessary to be held at a time to be determined by the commission. The commission shall appoint a commissioner and other officers as the commission considers necessary, none of whom may be a member of the commission, and shall fix the compensation and prescribe the duties of these appointees. The members of the commission shall receive no salary but must be allowed the usual mileage, subsistence, and per diem as authorized by law for commissions, committees, and boards.