Patent ID: 7628490

Claim:
A binocular slit lamp microscope for stereoscopically observing a patient's eye, comprising: an illumination section for irradiating slit illumination light to the patient's eye; a binocular microscope section including an observation optical system, including: an objective lens; right and left eyepieces; and right and left erect prisms placed between the objective lens and the right and left eyepieces, the observation optical system being adapted to allow reflection light of the slit illumination light from the patient's eye to pass therethrough; and rotating drum rotatably placed in a predetermined position between the objective lens and the right and left erect prisms on right and left optical paths of the observation optical system; an observation magnification changing optical system for changing observation magnification, the observation magnification changing optical system being placed on the rotating drum and including right and left variable magnification lenses to be placed symmetrically on the right and left optical paths; and a binocular viewing angle changing optical system for changing a binocular viewing angle between right and left viewing paths, the binocular viewing angle changing optical system being placed on the rotating drum and including right and left deflecting members to be placed symmetrically on the right and left optical paths, and the deflecting members being configured to symmetrically deflect the reflection light having passed through each of the deflection members toward an optical center axis of the objective lens or reversely, the observation magnification changing optical system and the binocular viewing angle changing optical system being selectively placed on the right and left optical paths by rotation of the rotating drum.