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- Marius_Tscherning abstract "Marius Hans Erik Tscherning (December 11, 1854 – 1939) was a Danish ophthalmologist.He studied ophthalmology under Edmund Hansen Grut (1831-1907) in Copenhagen, later becoming an adjunct director at the ophthalmological laboratory at the Sorbonne in Paris. Tscherning spent 25 years at the Sorbonne, where he worked closely with Louis Émile Javal (1839-1907). In 1910 he returned to Denmark as a professor at the University of Copenhagen and head of the ophthalmic department at the Rigshospitalet.Tscherning is remembered for contributions made in optical physiology. He conducted research of entoptic phenomenon, Purkinje images, the etiology of myopia, and Listing's law of ocular movement. He also designed an ophthalmophacometer, a device used to measure changes that happen in the front and back curvatures of the lens during accommodation.He is probably best known for his theory regarding the mechanism of accommodation, of which he disagreed with the accommodation theory proposed by Hermann von Helmholtz (1821-1894). Tscherning believed that accommodation occurred through an increase of zonular pressure at the lens equator with contraction of the ciliary muscle, and therefore a bulging of the lens in accommodation was created by compression rather than by passive dilatation. Tscherning was the author of over 100 scientific articles, including a book titled Optique physiologique, published in 1898 in Paris by Garré and Naud (Physiologic Optics), which was later translated into English, and Hermann von Helmholtz et la Théorie de l´Accommodation, Paris 1909 Octave Doin, (Hermann von Helmholtz and the Theory of Accommodation) which was critical to Helmholtz's work on the same subject, published in the Graefe's Archiv (volume 1, 1854).".
- Marius_Tscherning birthDate "1854-12-11".
- Marius_Tscherning birthYear "1854".
- Marius_Tscherning deathDate "1939".
- Marius_Tscherning deathYear "1939".
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- Marius_Tscherning dateOfBirth "1854-12-11".
- Marius_Tscherning dateOfDeath "1939".
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- Marius_Tscherning name "Tscherning, Marius".
- Marius_Tscherning shortDescription "Danish Ophthalmologist".
- Marius_Tscherning description "Danish Ophthalmologist".
- Marius_Tscherning description "Danish Ophthalmologist".
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- Marius_Tscherning subject Category:Danish_physicians.
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- Marius_Tscherning comment "Marius Hans Erik Tscherning (December 11, 1854 – 1939) was a Danish ophthalmologist.He studied ophthalmology under Edmund Hansen Grut (1831-1907) in Copenhagen, later becoming an adjunct director at the ophthalmological laboratory at the Sorbonne in Paris. Tscherning spent 25 years at the Sorbonne, where he worked closely with Louis Émile Javal (1839-1907).".
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- Marius_Tscherning name "Marius Tscherning".
- Marius_Tscherning name "Tscherning, Marius".
- Marius_Tscherning surname "Tscherning".