What is the minimum eye protection requirement for motorcycle riders in Massachusetts?

In Massachusetts, the law mandates that motorcycle riders must wear adequate eye protection to ensure safety while riding. The correct choice emphasizes that riders should use glasses, goggles, or a face shield specifically designed for this purpose. These items provide a barrier against debris, wind, and other environmental elements that could impair vision and lead to accidents.

Using appropriate eye protection significantly enhances visibility and safety while riding at speed, where even small particles can be hazardous. Regular sunglasses do not offer the level of protection required by law or the functionality needed to shield against various elements effectively. Similarly, contact lenses do not provide physical protection and could be susceptible to irritation from wind, dust, or debris. Therefore, it's crucial for riders to equip themselves with the correct type of eye protection as specified in option C to comply with the law and maintain safety on the road.