The 2X4 is designed to be worn with the glasses. Pouch included.
THE LENS COLOUR determines how much light will pass through a lens. To keep vision optimal, you need less light in sunny conditions and more in cloudy weather.
BROWN A superb all-round constant density lens. It provides the best combination of true colour transmission and contrast. The optimal performance is achieved in medium bright to bright conditions.
YELLOW These lenses work as light enhancers. Good for dusk and low light as well as for overcast days and evenings.