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Joseph Hasner, Ritter von Artha (August 13, 1819 – February 2, 1892) was an Austrian ophthalmologist born in Prague. He studied medicine at the University of Prague, and subsequently was an assistant at Johann Fischer's eye clinic in Prague, and later a lecturer and professor of ophthalmology. His brother, Leopold Hasner von Artha (1818-1891) was an influential Austrian politician.

Joseph Hasner was a professor at the University of Prague from 1852 until 1884. He is remembered for the discovery of plica lacrimalis, which is a fold of mucous membrane that guards the lower opening of the nasolacrimal duct. This membrane goes by other names, including "Hasner's valve" and "Hasner's fold". Also, he put forth the theory that myopia was caused by stretching of the eyeball. This being due to pulling on the posterior pole by the optic nerve.

Published works

Among his numerous publications is Klinische Vorträge über Augenheilkunde (Clinical Lectures on Ophthalmology), which is a collection of Hasner's lectures on eye diseases and ophthalmoscopy. Other noted writings by Hasner include:

  • Beiträge zur Physiologie und Pathologie des Tränenableitungsapparats (Contributions to the Physiology and Pathology of the Lacrimal Drainage Apparatus), 1851
  • Beiträge zur Physiologie und Pathologie des Auges (Contributions to the Physiology and Pathology of the Eye), 1873
  • Über die Grenzen der Akkommodation des Auges (On the Limits of Accommodation of the Eye), 1875
  • Das mittlere Auge in seinen physiologischen und pathologischen Beziehungen (The Median Eye in its Physiological and Pathological Relationships), 1879
  • Die Verletzungen des Auges in gerichtsärztlicher Beziehung (The Injuries of the Eye in Forensic Medical Relationships), In: Maschka's Handbuch der gerichtlichen Medizin, Tübingen 1880
  • Tycho Brahe und I. Kepler in Prag (Tycho Brahe and I. Kepler in Prague), 1872




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