Patent ID: 8351124

Claim:
A visual display device including one two-dimensional image displaying plane on which an observation image is displayed and an eyepiece optical system that forms two eye points to bring the observation image to both eyes of an observer, wherein: the eyepiece optical system includes at least a first optical element having a first reflection plane, and a second optical element having a second reflection plane; the first reflection plane is so disposed as to face the eye point in order of an optical path of reverse tracing that extends from the eye point to the two-dimensional image displaying plane; the second reflection plane is so disposed as to face the two-dimensional image displaying plane, and an optical axis connecting the first reflection plane to the eye point is so disposed as to cross an optical axis connecting the second reflection plane to the two-dimensional image displaying plane; both the first and second reflection planes have positive power; and diopter difference S (m −1 ) of the position of a virtual image associated with diopter is substantially equal to that of the position of a virtual image associated with convergence.