One of the drawbacks of smart glasses such as Google Glass can be considered conditional imperfect projection system. The image is projected on the glasses and may suffer from ambient lighting. At the same time lost the color and brightness. Solve the problem came from the developers of the company Carl Zeiss. It turned out interesting. As in the case of glasses Google and other similar systems using front projector, but the image is left on the spectacle lens in the form of a miniature screen, and is projected directly onto the retina of the eye. This achieves the effect of integration of digital image superimposed on the real.
To translate the luminous flux from the projector in the eye, a special prismatic lens and a Fresnel lens. Fresnel lens is applied to the glasses. It fully reflects the incident light from the projector to the pupil. The loss of brightness, sharpness and color are minimal. It is reported that the development is protected by 250 patents. The company works with a number of partners, and it is hoped that some of the big brands take advantage of the development.
The optical system, by the way, simply adapted to mass production. The lens system is made of polycarbonate by injection molding. The only restriction - the optics for the visually impaired people need to produce individually.
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