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Description and Operating Principle
The PLATO lenses are constructed with specially designed liquid crystal cells, powered by an electrical field applied across the two glass plates. Under command of a switching or electronic timing circuit, the experimenter is able to change the state of the cells from transparent to translucent, or light scattering. In the Open state, looking through the lenses is like looking through clear glass. In the Closed state, the spectacle lenses scatter light and thus take on a translucent milky texture, which prevents the subject from perceiving visual information. The subject''s eye nevertheless remains illuminated and does not have to re-adapt to light when re-opened. The lenses for each eye can be opened or closed independently. The response time is approximately 4 ms to open and 3 ms to close, with a compensatable delay of 4 ms.
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