Mirror coatings create interesting effects on spectacle lenses - from a light shimmer to a total mirror coating.
Here you can find some info about production aspects and Facts and Figures on a mirror coating.
Mirror coatings are created by the vacuum deposition of interference layers.
Unlike antireflection coatings whose effect is achieved by destructive interference, a mirror coating can be obtained by constructive interference. Due to the different thickness of the interference layers, different reflection colours can be achieved.
The mirror effect - the perceived intensity of the mirror coating - is dependent on the basic tint of the lens. In clear lenses or in lenses with only a light tint, the mirror layer is like a slight shimmer on the lens surface. The darker the tint, the more intensive the mirror effect becomes. In very dark tints, the wearer's eyes are no longer visible through the mirror coating.
Light is reflected at both interfaces of an AR coating. The two reflected wave trains of a certain wavelength can cancel each other out totally by interference if both the phase and amplitude requirements are met.