Clear what can we say perfect for night activities & indoor use. Amber & Yellow the best tint for cloudy days. They improve both contrast & depth perception in low light situations. This tint is also described as a "driving lens". These Lenses only fit the SL2 Frames not SL2 PROFeatures include: Shatterproof & scratch-resistant polycarbonate lenses 100% UVA UVB UVC Protection Optimized Magnification Zone (OMZ) reduces distortion & fatigue Available in +1.5 +2.0 or +2.5 spot diopters Easy installation instructions included Padded protective pouch included Tips on how to choose a viewing power: To select a viewing power consider how you will be using your Dual Eyewear. If you are a cyclist motorcycle rider or driver looking for a clear read of instruments you might want to consider a magnification that is a bit weaker than what you use to read a book. For example if you use 2.0 readers at home or at the office try a 1.5. This drop in strength will not hinder your ability to focus on small text items like your cell phone or a menu at a restaurant. Tips on how to choose a lens
Colour: Smoke/ Gray (stock lenses) it transmits all colors evenly without changing color value. Light enough not to impair vision but dark enough to provide overall protection from glare. Excellent for bright sunny days. Clear (accessory lenses) what can we say perfect for night activities & indoor use. & in those dark cloudy days they still provide UV protection. Yellow (accessory lenses) the best tint for cloudy days. They improve both contrast & depth perception in low light situations. This tint is also described as a "driving lenses".