Any person not lawfully authorized to practice optometry, who shall practice optometry or shall hold himself or herself out as a practitioner thereof, or who shall impersonate another practitioner or who shall violate any provisions of this chapter, or any rule or regulation made under authority thereof, shall be punished for the first offense by a fine not less than $50 nor more than $200, or by imprisonment for not more than 3 months, or both. And for a subsequent offense by a fine not less than $200 nor more than $500 or by imprisonment for not less than 3 nor more than 6 months, or both.