The Conversion technology quickly changes from light to dark and back, while blocking harmful UV rays. Conversion photochromic technology is available with FastGrind ADDvantage HD Plus Progressives, Single Vision, and Finished Single Vision lenses. FT 28 Conversion lenses will also be available in the coming months.

Conversion offers a fast and seamless shift between tinted and clear allowing Conversion to compete with the market leading photochromics. Conversion’s photochromic properties are in-mass, which means that its quality performance will stay truer longer. The special monomer used will not yellow over time, unlike the lenses that use coatings. Additionally, the use of a monomer solution retains the shift-speed (rate from light to dark and back to light) longer than coatings that start to decrease their shift-rate as soon as after six months of use.