| 摘要 |
Optical axes S of eyepiece lenses 15 are parallel to each other and are perpendicular to surfaces of electronic image display panels 12. The optical axes S pass through central parts X of the electronic image display panels 12 that are main observation points of an observer, i.e., an assistant B. When observing the electronic image display panels 12, visual axes of the eyes P of the assistant will not form large angles with respect to the electronic image display panels 12, and therefore, the assistant B can stereoscopically observe electronic images displayed on the electronic image display panels 12 at an original binocular parallax provided by an objective lens 5 of an operating microscope 2. As results, the assistant feels no eye fatigue or headache even when observing the images for a long time.
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