MICROSCOPE

A microscope, such as an eyebell microscope used for observing an eyeball cornea, eye-ground and the like, which is arranged to illuminate an object for observation with a light beam projected through one half of the objective lens and to form an image of the object with the light reflected back through the other half of the same objective lens, wherein a special iris for confining the illuminating light beam is inserted in the illuminating optics in order to prevent the illuminating light from mixing in the image forming light and reducing contrast of the image.