Foils may be cut to fit most frame sizes and shapes and adhere to existing lenses with only water.
Visual acuity approximated by each foil.
Removable and Reusable.Similar to a window cling on.
The more often it is removed and re-applied it will gather oils and dust and will not stick as well.
Expected life of a foil will depend on how often it is removed - one -two months if it is not removed less if removed daily.
NOTICE: The duration of the adhesion of the occlusion foils can be limited when used on lenses utilizing nano-technology (such as but not limited to Crizal lenses).