No-Glare lenses, or Anti-Reflective (AR) lenses, work through the concept of wave theory.

Most people know that light travels through space in a wavelike motion.  The distance between the crests and troughs of the wave is called the wavelength.  Visible light has wavelengths ranging from approximately 380 nanometers (violet light) to 780 nanometers (red light).

No-Glare lenses reduce reflections through a process called destructive interference.  Two light waves that are opposing wavelenths will cancel each other.  Depending upon the refractive index of the material- and the angle at which light strikes the lens- a certain amount of light will reflect from the lens surface without an anti-reflective coating.

A layer of the anti-reflective coating will create an additional reflection on the lens surface.  This secondary reflection is created in opposition to the reflection (destructive interference) resulting in the elimination of the reflection.