Night vision glasses

Image-intensifying glasses 100 that are suitable for certain commercial and entertainment applications by virtue of their light weight, small size, and economical production, compared to certain other night vision products. In one disclosed embodiment, input light passes through two Amici prisms 144 and 148 and a field-flattening lens 150 to reach an image intensifier 152. The intensified image it produces is reflected off a first folding mirror 162, passes through a lens 154, reflects off a curved mirror 156, and passes back through the lens 154 the other way. The intensified image then passes through two additional, non-doublet lenses 158 and 160, between which an intermediate image exists. The intensified image then reflects off the "lens," or visor 130, of the glasses and proceeds to the pupil of eye 131 of the wearer. Alternative embodiments use a helmet visor, mirror, or other (at least partially) reflective surface for the final reflection.