Abstract: In an optical microscope, particularly an optical microscope having optics which include divergent beams of light being transmitted to the eyepieces, a facility for display or teaching is provided by replacing a conventional eyepiece with an eyepiece (21) which includes a light tube (22a) and respective inlet and outlet lenses (26) and (27), said light tube (22a) accommodating a beam splitter such as a semi-silvered mirror (29) to deflect a portion (30) of light passing through tube (22a) laterally towards a camera (32).