Paper-thin optical lenses simple enough to mass produce like microchips could enable a new generation of compact optical devices. Researchers have fabricated and tested flat lenses called Fresnel zone ...
But safety tests by scientists working for Boots at the firm's laboratory in Nottingham suggest that tinted lenses can block out certain colours and adversely affect vision. The team found that a ...
The current drawback with the new FZPs is that they only have a light-gathering efficiency of 7%, meaning they produce excessively noisy images ... Reference: “Optical Fresnel zone plate flat lenses ...