State law requires a health screening prior to entry (which may or may not specifically include vision, hearing, dental, or BMI exams).
Wisconsin School Nursing Handbook: Health Screening & Appraisals
The school nursing handbook provides guidance to school nurses and school nursing programs for health screenings, including growth, dental, vision, and hearing screenings.
Wisconsin Statutes and Annotations 118.135 Eye examinations and evaluations.
(1) Beginning in the 2002-03 school year, each school board and each charter school shall request each pupil entering kindergarten to provide evidence that the pupil has had his or her eyes examined by an optometrist licensed under ch. 449 or evaluated by a physician licensed under ch. 448.