FL-41 is a generic tint that has been proven to help with conditions associated with light sensitivity.  We are the original retailer of SpectraShield tinted lenses online.  Our proprietary Spectrashield tint looks distinctly different than the generic  FL-41 version.  Our blend has been fine-tuned over 20 years.

It successfully blocks the distressing portion of the light spectrum, which bothers light sensitive people and causes cumulative eye damage over a lifetime.  To accommodate as many people as possible, we also offer some variant lenses.  Our outdoor version of the tint has the greatest filtration power.  We are the exclusive manufacturer of SpectraShield tinted transitions and 365-day Soft Contact Lenses.  All of our lenses block UVA and UVB light.  For complete protection against reflected UV light, add our Premium Multipurpose Coating.