Method of making and using a rigid endoscope having a modified high refractive index tunnel rod

摘要: The invention provides a rigid endoscope utilizing high refractive index (HRI) tunnel rod, preferably made of glass, for transfer image light from distal end to proximal the device, such HRI rod being modified so that minimum is scattered and reflected within thus minimizing veiling glare contrast reduction which formed near rod's end. shortens apparent distance by virtue its greater than air, also can carry over relatively long inside walls. A preferred method modification includes hydrogen firing in order create thoroughly blackened inner surface highly non-reflective, even at grazing incidences. Relatively simple lenses are incorporated ends formation as cover wide object field relay video camera. Stereo measuring embodiments dual optical paths yielding two images containing parallax data.