Carl Zeiss Jena - Trial Lens Set "Fernrohrbrillen" (Probierkasten) for Severe Myopia - ca. 1912-1920 A museum-grade and extremely rare optical trial lens set (Probierkasten) manufactured by Carl Zeiss Jena, specifically designed for fitting telescopic spectacles (Fernrohrbrillen) for patients with severe myopia Developed around 1909–1912 by Dr. Moritz von Rohr in collaboration with Nobel Laureate Allvar Gullstrand (Nobel Prize in Medicine, 1911). Highlights & Features:Original Wooden Case: Birch/maple wood with fine dovetail joints, measuring 26x21x6cm. Stamped with the iconic CARL ZEISS JENA logo on top and sharp typography inside.Two Trial Frames Included: Includes the heavy black-laquered Zeiss Probierbrille with fine-adjustment knobs and angular scales, plus an additional classic lightweight metal trial frame.Lenses & Accessories: Full range of negative lenses (diopters -8 to -30), explicitly engraved CARL ZEISS on the rims/glass. Complete with cylinder rings, protective yellow felt pads, and aperture covers.Condition:Excellent historical condition. The wooden case and brass hardware are 100% sound. Velvet lining shows minimal wear.