Patent ID: 8907865

Claim:
An optical position adjustment method of a head mounted display, the head mounted display including: (a) an eyeglass type frame worn on a head of a viewer, and (b) two image display devices for right and left eyes attached to the frame, and each of the image display devices including: (A) an image forming device, and (B) an optical device adapted to receive, guide and emit light emitted from the image forming device, wherein the optical position adjustment method comprises the steps of: controlling an image signal, which is supplied to the image forming device making up at least one of the image display devices, to control a position of the image displayed on the optical device making up at least one of the image display devices and adjust mutual positions of two images; and based at least in part on the distance from the head mounted display to a target, further controlling the image signal to adjust a convergence angle commensurate with a distance from the head mounted display to the target.