When does high school softball need to have a batter's eye box?

High school softball typically requires a batter's eye box when the field's layout makes it difficult for batters to see the ball against the background, such as when there are bleachers or other distractions in the outfield. This is often mandated to ensure player safety and fair play. The specific regulations can vary by state or governing body, so it's important for schools to consult their local athletic association for precise requirements.