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Landolt Ophthalmotrope 1893
The Landolt ophthalmotrope is one of the most visually spectacular instruments in the history of ophthalmic science. This example dates to 1893 and was made by E. B. Meyerowitz. It is constructed from anodized and lacquered brass — a warm, burnished material that gives the instrument an extraordinary sculptural presence. It stands 33cm tall and extends to 45cm. The diameter of the sphere cage is 11cm.
Origins of the Ophthalmotrope
The first ophthalmotrope was described by Ruete in 1845. Ruete used a Cardan joint — also known as a universal joint, invented by Cardano (1501–1576) — which made it possible to use the center of rotation for the optics. The Landoldt model simplified the Ruete design while retaining the Cardan suspension. Edmund Landoldt (1846–1926) invented this refined version in 1893.
What the Ophthalmotrope Does
The ophthalmotrope demonstrates the movement of the eye. It is a mechanical model used to teach the complex rotational mechanics of ocular motility. The innermost sphere represents the eye. It turns on a number of axes, replicating the actions of the six extraocular muscles. The telescoping lacquered brass base and stand support the frame during demonstration. This instrument was essential for teaching students and clinicians how the eye moves in all directions of gaze.
Construction by E. B. Meyerowitz
E. B. Meyerowitz was the maker of this exceptional piece. The telescoping base allows the instrument to be raised or lowered for demonstration purposes. The quality of the brass work and the precision of the mechanical joints reflect the high standards of late 19th century scientific instrument making.
Collectibility
The Landolt ophthalmotrope is among the most beautiful and desirable objects in all of ophthalmic collecting. Its combination of scientific significance, mechanical ingenuity, and visual beauty makes it exceptional. Examples in this condition are extremely rare.
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