What is the function of the visor on some helmets?

The function of the visor on some helmets is primarily to shield the eyes from the sun and rain. This feature is essential for ensuring visibility and protecting the wearer from environmental elements that could obstruct their line of sight. By reducing glare from sunlight and preventing raindrops from falling directly into the eyes, the visor enhances the overall safety and comfort of the helmet wearer, especially in outdoor conditions.

Visors play an important role in various applications, such as biking, motorcycling, or construction, where maintaining clear visibility is crucial for safe operation. While airflow, sound quality, and aesthetics may be considerations in helmet design, they are not the primary functions of a visor. The visor's primary role is to provide eye protection, thereby allowing users to focus on their activities without distraction or risk from the weather.