Abstract: An eyepiece structure for a surgical microscope includes an inner barrel, an intermediate barrel, and outer barrels. When the outer barrels are rotated, a protrusion of the inner barrel is guided along a spiral groove of the outer barrel and is moved back and forth along an optical axis. The protrusion is guided through a straight hole of the intermediate barrel that is not rotatable, and therefore, the inner barrel moves along the optical axis without rotating around the optical axis. An astigmatic lens is added to the inner barrel that is nonrotatable, to enable a surgeon suffering from astigmatism to conduct a surgical operation without glasses.

Abstract: An electronic image display panel is a reflective liquid crystal panel. With respect to the surface of the electronic image display panel, an optical axis of an eyepiece lens is perpendicular. The optical axis passes through a central part of the electronic image display panel that is a main observation point of an observer. When observing the electronic image display panel, a visual axis of an eye of the observer forms no large angle with respect to the electronic image display panel and the observer can stereoscopically observe electronic images displayed on the electronic image display panels at an original binocular parallax provided by an objective lens of a surgical microscope. As a result, the observer feels no eye fatigue or headache even when observing the images for a long time.

Abstract: A device for displaying an image is provided. The device includes a hub that is configured to rotate about a first axis and a motor configured to rotate the hub about the first axis. A plurality of light detecting devices attached to the hub and at least one lens configured to direct light toward the light detecting devices are provided. Furthermore, the device includes at least one radial member oriented along a radial axis, the radial member having a first end attached to the hub and a second end. The radial member includes a plurality of light-emitting devices disposed therein, the light emitting devices being oriented along the radial axis. The device also includes a power source operably coupled to the motor, power source and light-emitting devices, wherein the light emitting devices emit light in response to light received by the light detecting devices.

Abstract: A device for displaying messages method of using the same, and machine readable program are provided. The device includes an elongate member having a proximal end, a distal end and defines a longitudinal axis. The device further includes a housing having a proximal end and a distal end, where the proximal end of the housing is coupled to the distal end of the elongate member. The housing includes a plurality of light-emitting devices disposed therein. The light emitting devices are oriented along the longitudinal axis. The device also includes a power source and a processor. The processor is operably coupled to the power source and light-emitting devices, wherein the processor is configured to cause the light emitting devices to emit light at predetermined intervals. The device causes a message to be displayed to an observer when the device is rotated about an axis of rotation at a predetermined rotational velocity.