Light incident on the lens from behind is reflected into the eye of the wearer. He perceives annoying reflected images or a sensation of haze from objects behind him. Light striking the lens from the front is subjected to multiple reflection in the interior of the lens. When leaving the lens, it enters the wearer’s eye and is perceived as haze.
Reflections also occur on the cornea of the eye, these being reflected from the spectacle lens into the eye and perceived there as reflected images. The wearer then sees a reflected image of his own eye.
All these reflected images and haze are superimposed on the direct image. They reduce contrast and can even falsify the information content of the perceived image. They are particularly irritating when the wearer is driving at night or on a wet road.
Reflections directed in a forward direction are not perceived by the wearer. However, they do prevent anyone looking at him from seeing his eyes clearly and hence constitute a cosmetic drawback.
All reflections occurring on a lens result in a reduction in transmission.