Image-intensifying or night vision glasses 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 embodiment, input light passes through two Amici prisms and a field-flattening lens to reach an image intensifier. The intensified image it produces is reflected off a first folding mirror, passes through a lens, reflects off a curved mirror, and passes back through the lens the other way. The intensified image then passes through two additional, non-doublet lenses, between which an intermediate image exists. The intensified image then reflects off the “lens” or visor of the glasses and proceeds to the pupil of the eye of the wearer. Alternative embodiments use a helmet visor, mirror, or other (at least partially) reflective surface for the final reflection.