Abstract: An observation device having a positioning unit for positioning an optical unit in a beam path of a microscope objective and an eye to be observed, and a related method for observing an eye. The positioning unit includes a connection device, a positioning device, an accommodating device and the optical unit having a lens for observing a fundus of the eye, and a further optical element, the positioning unit comprising a pivoting mechanism by which the optical unit is pivotable out of or into the beam path, the positioning unit being couplable to the microscope by the connection device, the lens being adapted on the positioning device by the accommodating device, the accommodating device at least predominantly made of plastic material, wherein the positioning device has a lens barrel which is disposed on the pivoting mechanism in a pivotable manner, the lens barrel at least predominantly made of metal.

Abstract: An observation device having a positioning unit for positioning an optical unit in a beam path of a microscope between a microscope objective and an eye to be observed and a related method are provided. The positioning unit comprising a connection device, a positioning device, an accommodating device and the optical unit having a lens, which serves to observe a fundus of the eye, and a further optical element, the positioning unit comprising a pivoting mechanism by which the optical unit is pivotable relative to the beam path, the positioning unit couplable to the microscope by the connection device, the lens being adapted on the positioning device by the accommodating device, wherein the further optical element disposed below the pivoting mechanism, the further optical element movable in the longitudinal direction of the beam path relative to the microscope by the positioning device.

Abstract: A sighting device has an illuminating device for making a colored target available. A brightness sensor (23) is assigned to the illuminating device (6) for detecting the brightness in the target region and a programmable control unit (15) is provided via which the operation of the sighting device can be adjusted.