Filter Category: 0
Transmintance: 80%—100%

Transparent or very light tint; very low sunlight absorption — for very light-sensitive eyes

Filter Category: 1
Transmintance: 43%—80%

Light tint; low sunlight absorption — for cloudy or contrary weather

Filter Category: 2
Transmintance: 18%—43%

Medium tint; normal sunlight absorption — for sunny days in Central Europe

Filter Category: 3
Transmintance: 8%—18%

Dark tint; high sunlight absorption — for Southern countries

Filter Category: 4
Transmintance: 3%—8%

Very dark tint; highest sunlight absorption — for high mountain regions, glaciers and the snow. Not suitable for driving!

A = Lens height

For the height of your glasses measure straightly from the top down of the glass.

B = Lens width

For the width of your glasses measure straightly from the left to the right side of the glass.