Jacob Hermann Knapp (March 17, 1832 – April 30, 1911), also known as Hermann Knapp, was a
German-American
German Americans (, ) are Americans who have full or partial German ancestry.
According to the United States Census Bureau's figures from 2022, German Americans make up roughly 41 million people in the US, which is approximately 12% of the pop ...
ophthalmologist
Ophthalmology (, ) is the branch of medicine that deals with the diagnosis, treatment, and surgery of eye diseases and disorders.
An ophthalmologist is a physician who undergoes subspecialty training in medical and surgical eye care. Following a ...
and
otolaryngologist
Otorhinolaryngology ( , abbreviated ORL and also known as otolaryngology, otolaryngology–head and neck surgery (ORL–H&N or OHNS), or ear, nose, and throat (ENT)) is a surgical subspecialty within medicine that deals with the surgical an ...
.
Biography
Knapp was born in Dauborn, Nassau. He earned his medical degree from the
University of Giessen
University of Giessen, official name Justus Liebig University Giessen (), is a large public research university in Giessen, Hesse, Germany. It is one of the oldest institutions of higher education in the German-speaking world. It is named afte ...
in 1854. As a young physician he studied with
Franciscus Cornelis Donders
Franciscus (Franz) Cornelius Donders FRS FRSE (27 May 1818 – 24 March 1889) was a Dutch ophthalmologist. During his career, he was a professor of physiology in Utrecht, and was internationally regarded as an authority on eye diseases, directin ...
in
Utrecht
Utrecht ( ; ; ) is the List of cities in the Netherlands by province, fourth-largest city of the Netherlands, as well as the capital and the most populous city of the Provinces of the Netherlands, province of Utrecht (province), Utrecht. The ...
London
London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
,
Albrecht von Graefe Albrecht von Graefe may refer to:
* Albrecht von Graefe (ophthalmologist) (1828-1870), Prussian ophthalmologist
* Albrecht von Graefe (politician) (1868-1933), German politician and landowner
{{hndis, Graefe, Albrecht von ...
in
Berlin
Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...
and
Hermann von Helmholtz
Hermann Ludwig Ferdinand von Helmholtz (; ; 31 August 1821 – 8 September 1894; "von" since 1883) was a German physicist and physician who made significant contributions in several scientific fields, particularly hydrodynamic stability. The ...
in
Heidelberg
Heidelberg (; ; ) is the List of cities in Baden-Württemberg by population, fifth-largest city in the States of Germany, German state of Baden-Württemberg, and with a population of about 163,000, of which roughly a quarter consists of studen ...
. From 1860 until 1868 he was a professor of
ophthalmology
Ophthalmology (, ) is the branch of medicine that deals with the diagnosis, treatment, and surgery of eye diseases and disorders.
An ophthalmologist is a physician who undergoes subspecialty training in medical and surgical eye care. Following a ...
at Heidelberg.
He emigrated to
New York City
New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...
, where he worked as a
surgeon
In medicine, a surgeon is a medical doctor who performs surgery. Even though there are different traditions in different times and places, a modern surgeon is a licensed physician and received the same medical training as physicians before spec ...
. In 1869 he founded the New York Ophthalmic and Aural Institute, which from 1913 to 1939 was called the Herman Knapp Memorial Hospital. In 1882, he was made professor of the
New York University
New York University (NYU) is a private university, private research university in New York City, New York, United States. Chartered in 1831 by the New York State Legislature, NYU was founded in 1832 by Albert Gallatin as a Nondenominational ...
Columbia University
Columbia University in the City of New York, commonly referred to as Columbia University, is a Private university, private Ivy League research university in New York City. Established in 1754 as King's College on the grounds of Trinity Churc ...
, and in 1902 he became emeritus professor. His son, Arnold Knapp (1869–1956) was also a noted ophthalmologist.
In 1869, with Salomon Moos (1831–1895), he founded the "Archives of Ophthalmology and Otology" (''Archiv für Augen- und Ohrenheilkunde''), an international scientific monthly journal that was published in
Wiesbaden
Wiesbaden (; ) is the capital of the German state of Hesse, and the second-largest Hessian city after Frankfurt am Main. With around 283,000 inhabitants, it is List of cities in Germany by population, Germany's 24th-largest city. Wiesbaden form ...
(in German) and New York (in English). In 1878 the archives split into two independent entities; as the "Archives of Ophthalmology" (''Archiv für Augenheilkunde'') and the "Journal of Otology" (''Zeitschrift für Ohrenheilkunde'').
His name is lent to the eponymous "Knapp streaks"; also known as
angioid streaks
Angioid streaks, also called Knapp streaks or Knapp striae, are small breaks in Bruch's membrane, an elastic tissue containing membrane of the retina that may become calcified and crack. Up to 50% of angioid streak cases are idiopathic. It may o ...
, which are tiny breaks in the
elastin
Elastin is a protein encoded by the ''ELN'' gene in humans and several other animals. Elastin is a key component in the extracellular matrix of gnathostomes (jawed vertebrates). It is highly Elasticity (physics), elastic and present in connective ...
eye
An eye is a sensory organ that allows an organism to perceive visual information. It detects light and converts it into electro-chemical impulses in neurons (neurones). It is part of an organism's visual system.
In higher organisms, the ey ...
. He devised his own version of an ophthalmotrope, a device used in
physiological
Physiology (; ) is the science, scientific study of function (biology), functions and mechanism (biology), mechanisms in a life, living system. As a branches of science, subdiscipline of biology, physiology focuses on how organisms, organ syst ...
optics
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of optical instruments, instruments that use or Photodetector, detect it. Optics usually describes t ...
to demonstrate the action of ocular muscles individually or in various combinations. Several instruments used in
eye surgery
Eye surgery, also known as ophthalmic surgery or ocular surgery, is surgery performed on the eye or its adnexa. Eye surgery is part of ophthalmology and is performed by an ophthalmologist or eye surgeon. The eye is a fragile organ, and require ...
bear his name, including the "Knapp
trachoma
Trachoma is an infectious disease caused by bacterium '' Chlamydia trachomatis''. The infection causes a roughening of the inner surface of the eyelids. This roughening can lead to pain in the eyes, breakdown of the outer surface or cornea ...
forceps
Forceps (: forceps or considered a plural noun without a singular, often a pair of forceps; the Latin plural ''forcipes'' is no longer recorded in most dictionaries) are a handheld, hinged instrument used for grasping and holding objects. Forcep ...
".
Knapp is interred in New York City at
Woodlawn Cemetery Woodlawn Cemetery is the name of several cemeteries, including:
Canada
* Woodlawn Cemetery (Saskatoon)
* Woodlawn Cemetery (Nova Scotia)
United States
''(by state then city or town)''
* Woodlawn Cemetery (Ocala, Florida), where Isaac Rice and fa ...
.
Selected writings
* "Curvature of the
Cornea
The cornea is the transparency (optics), transparent front part of the eyeball which covers the Iris (anatomy), iris, pupil, and Anterior chamber of eyeball, anterior chamber. Along with the anterior chamber and Lens (anatomy), lens, the cornea ...
of the Human Eye" (, Heidelberg, 1859)
* "Intraocular Tumors" (Karlsruhe, 1868), New York", 1869)
* "Cocaine and its Use in Ophthalmic and General Surgery" (New York, 1885)
* "Investigations on Fermentation, Putrefaction, and Suppuration" (1886)
* "Cataract Extraction without
Iridectomy
An iridectomy, also known as a surgical iridectomy or corectomy, is the surgical removal of part of the iris.Cline D; Hofstetter HW; Griffin JR. ''Dictionary of Visual Science''. 4th ed. Butterworth-Heinemann, Boston 1997.