What does flash mirror coating provide for sunglasses?

Flash mirror coating provides a reflective coating on the front surface of sunglasses lenses, creating a mirrored appearance. This aesthetic aspect not only offers a stylish look but also serves practical functions. The mirror effect helps to reduce the amount of light that passes through the lenses, enhancing visual comfort in bright conditions. Additionally, this coating can help to minimize glare, making it beneficial for wearers who spend time outdoors or in bright environments, such as at the beach or while driving.

The other options do not accurately describe the purpose of flash mirror coatings; they focus on features that are not directly related to the mirrored look on the front of the lenses.