The eVysor eQuick spectacle lenses are sold in spare parts separately from the eVysor mask frame. They are sold in pairs.
 
Which glasses lens to choose:
Transparent: filter 0 / light transmission: 98.08%
Mirrored Orange: filter 1 / light transmission: 46.28%
Mirrored Blue: filter 2 / light transmission: 42.63%
Mirrored Green: filter 2 / light transmission: 38.41%
Mirrored Rainbow: filter 2 / light transmission: 19.85%
Darker: filter 3 / light transmission: 10.45%