A "large field" visor implies that it offers a broader coverage area compared to standard-sized visors, providing more shade and protection from sunlight.  Using a sunshade on your windshield can also help in reducing glare and protecting your car's interior from the sun.

Name: Car large field visor
Advantage 1: Reducing visual fatigue
Advantage 2: Soften the sun
Advantage 3: Effective prevention of snow blindness
Advantage 4: Increase the distance of fog
Advantage 5: The lens can move left and right