Anti-Reflection Coating
Overview of AR Coating

Figure A below depicts the �coke bottle effect� which occurs when the edges of the lenses are thicker. In figure B a light source enters the edge of the lens and causes a muted reflection which is seen by the observer and the wearer. Bright objects to the rear of the wearer will also cause a reflection from the front and rear surface of the lens to the wearer�s eye.

Figure A
"Coke bottle" effect caused by thick lens edges.

Figure B
Muted reflections seen by the wearer and the observer.

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One of the most common reflections is that of the wearer�s own eye. These reflections are generated from both the front and rear surface of the lens and will include the wearer�s eyelashes and facial skin in the immediate area of the lens. These so-called �ghost� images are reflected toward the optical center of a minus lens. Reflections will not exceed more than 8 percent of the total light or 4 percent per surface as a general rule, but represent a significant number of distractions to which a wearer will be subjected. These reflections, plus the reduced light transmitted to the eye, can impact the vision of the wearer.

Figure C
Reflections generated from both the back and front surfaces.