If the board of education of a city, exempted village, or local school district has not employed a school physician, the board of health shall conduct the health examination of all school children in the health district and shall report the findings of such examination and make such recommendations to the parents or guardians as are deemed necessary for the correction of such defects as need correction. This section does not require any school child to receive a medical examination or receive medical treatment whose parent or guardian objects thereto.