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Edward Jackson (ophthalmologist)
Edward Jackson (March 30, 1856 - October 29, 1942) was an American ophthalmologist better known for popularizing retinoscopy in the United States. He also described detecting astigmatism and its correct axis using a cross-cylinder. The modified Stokes lens he made was later known as Jackson's cross-cylinder. Biography Edward Jackson was born March 30, 1856, in West Goshen Township, Chester County, Pennsylvania, the son of Holiday and Emily Jackson. He completed his Bachelor of Science in Civil Engineering from Union College, New York in 1874, and in 1878 received his medical degree from the University of Pennsylvania. Jackson married Jenny L. Price in 1878. After she died in 1896, he settled in Denver in 1898, where he married Emily Churchman. Jackson died of heart block on October 29, 1942, at the age of 86. Career Jackson, who served as Professor of Ophthalmology at the Penn Medicine Rittenhouse (previously Philadelphia Polyclinic) and surgeon at Wills Eye Hospital later bec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Goshen Township, Chester County, Pennsylvania
West Goshen Township is a township in Chester County, Pennsylvania, United States. The population was 23,040 at the 2020 census. In 2013, ''Money Magazine'' voted West Goshen as the 10th best place to live in America. West Goshen has also been ranked in the top 15 places to live in America from 2014 to 2017 and is also at the top of best neighborhoods to raise a family in Pennsylvania every year. The headquarters for QVC is in West Goshen Township, though its address is in West Chester. West Goshen Township is also where the headquarters for A. Duie Pyle Trucking, Teva Pharmaceuticals, and Lasko Industries are located. There are more than 465 businesses which call West Goshen Township home. History The lands of Goshen were purchased in 1681 from William Penn as part of the Welsh tract of Westtown. By 1704, Goshen and Westtown had become separate townships. In 1788, the formation of the Borough of West Chester reduced the size of Goshen. Finally, in 1817, the Township divided i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stokes Lens
Stokes lens also known as variable power cross cylinder lens is a lens used to diagnose a type of refractive error known as astigmatism. Lens design The Stokes lens also known as variable power cross cylinder lens, in its standard version, is a lens combination consisted of equal but opposite (one plano-convex and other plano-concave) power cylindrical lenses attached together in a way so that the lenses be rotated in opposite directions. When the axes are parallel, the two powers cancel each other out to achieve the resulting power zero; When the axes are vertical, a sphero-cylindrical lens with maximum power is obtained. Uses Stokes lens is a lens used to diagnose and measure astigmatism. Adaptations American ophthalmologist Edward Jackson (ophthalmologist), Edward Jackson revised the Stokes lens concept and made a cross cylinder lens to refine power and axis of astigmatism. This lens combination is known as Jackson cross cylinder. Based on the Stokes lens, James P. Foley and C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Ophthalmologists
American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, people who self-identify their ancestry as "American" ** American English, the set of varieties of the English language native to the United States ** Native Americans in the United States, indigenous peoples of the United States * American, something of, from, or related to the Americas, also known as "America" ** Indigenous peoples of the Americas * American (word), for analysis and history of the meanings in various contexts Organizations * American Airlines, U.S.-based airline headquartered in Fort Worth, Texas * American Athletic Conference, an American college athletic conference * American Recordings (record label), a record label previously known as Def American * American University, in Washington, D.C. Sports teams Soccer * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Academy Of Ophthalmology
The American Academy of Ophthalmology (Academy) is a professional medical association of ophthalmologists. It is headquartered in San Francisco, California. Its membership of 32,000 medical doctors includes more than 90 percent of practicing ophthalmologists in the United States as well as over 7,000 members abroad. The Academy's stated mission is "to protect sight and empower lives by serving as an advocate for patients and the public, leading ophthalmic education, and advancing the profession of ophthalmology." History The academy has its origins in the American Academy of Ophthalmology and Otolaryngology (AAOO), founded in 1896 as a medical association of both ophthalmologists and otolaryngologists. The Academy was founded when the AAOO split in 1979 and divided into separate academies for each specialty. Like most medical associations, the Academy collects dues, provides continuing education and seminars for its members, including its four-day annual meeting. Outside the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Board Of Ophthalmology
The American Board of Ophthalmology (ABO) is an independent, non-profit organization responsible for certifying ophthalmologists (eye physicians and surgeons) in the United States of America. Founded in 1916, the ABO was the first American Board established to certify medical specialists. The ABO is the founding member of the American Board of Medical Specialties. Originally, a combined board of Ophthalmology & Otolaryngology, the specialties split into two board backed specialties in the 1960s. Certification by the American Board of Ophthalmology is a voluntary process that involves a written and an oral examination. A candidate who passes both the written qualifying and oral examinations becomes a Board Certified Diplomate of the American Board of Ophthalmology. See also * American Board of Medical Specialties * American Osteopathic Board of Ophthalmology and Otolaryngology The American Osteopathic Boards of Ophthalmology and Otolaryngology - Head and Neck Surgery (AOBOO) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Academy Of Ophthalmology And Otolaryngology
The American Academy of Ophthalmology (Academy) is a professional medical association of ophthalmologists. It is headquartered in San Francisco, California. Its membership of 32,000 medical doctors includes more than 90 percent of practicing ophthalmologists in the United States as well as over 7,000 members abroad. The Academy's stated mission is "to protect sight and empower lives by serving as an advocate for patients and the public, leading ophthalmic education, and advancing the profession of ophthalmology." History The academy has its origins in the American Academy of Ophthalmology and Otolaryngology (AAOO), founded in 1896 as a medical association of both ophthalmologists and otolaryngologists. The Academy was founded when the AAOO split in 1979 and divided into separate academies for each specialty. Like most medical associations, the Academy collects dues, provides continuing education and seminars for its members, including its four-day annual meeting. Outside the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Journal Of Ophthalmology
''American Journal of Ophthalmology'' is a monthly peer-reviewed medical journal covering ophthalmology. It was established in 1884 and is published by Elsevier. The editor-in-chief is Richard K. Parrish II (Bascom Palmer Eye Institute). Indexing and abstracting The journal is indexed and abstracted in the following databases: See also *''British Journal of Ophthalmology'' *''Ophthalmology Ophthalmology ( ) is a surgical subspecialty within medicine that deals with the diagnosis and treatment of eye disorders. An ophthalmologist is a physician who undergoes subspecialty training in medical and surgical eye care. Following a medic ...'' References External links * Ophthalmology journals Elsevier academic journals English-language journals Publications established in 1884 Monthly journals {{med-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylindrical Lens
A cylindrical lens is a lens which focuses light into a line instead of a point, as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it into a line parallel to intersection of the surface of the lens and a plane tangent to it along the cylinder's axis. The lens converges or diverges the image in the direction perpendicular to this line, and leaves it unaltered in the direction parallel to its cylinder's axis (in the tangent plane). A toric lens combines the effect of a cylindrical lens with that of an ordinary spherical lens. Uses Uses in optometry * Cylindrical lenses are prescribed to correct astigmatism. * Cross cylinder, which is a combination of two cylindrical lenses with equal strength and opposite power, is used in subjective refraction to diagnose astigmatism, and assess the strength and axis of the astigmatic power etc. * Maddox rods, made up of cylindrical lenses arranged in parallel, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heart Block
Heart block (HB) is a disorder in the heart's rhythm due to a fault in the natural pacemaker. This is caused by an obstruction – a block – in the electrical conduction system of the heart. Sometimes a disorder can be inherited. Despite the severe-sounding name, heart block may cause no symptoms at all in some cases, or occasional missed heartbeats in other cases (which can cause light-headedness, syncope (fainting), and palpitations), or may require the implantation of an artificial pacemaker, depending upon exactly where in the heart conduction is being impaired and how significantly it is affected. Heart block should not be confused with other conditions, which may or may not be co-occurring, relating to the heart and/or other nearby organs that are or can be serious, including angina (heart-related chest pain), heart attack (myocardial infarction), any type of heart failure, cardiogenic shock or other types of shock, different types of abnormal heart rhythms (arrhythmias ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astigmatism
Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power. This results in distorted or blurred vision at any distance. Other symptoms can include eyestrain, headaches, and trouble driving at night. Astigmatism often occurs at birth and can change or develop later in life. If it occurs in early life and is left untreated, it may result in amblyopia. The cause of astigmatism is unclear; however, it is believed to be partly related to genetic factors. The underlying mechanism involves an irregular curvature of the cornea and protective reaction changes in the lens of the eye, called lens astigmatism, that has the same mechanism as spasm of accomodation. Diagnosis is by an eye examination called autorefractor keratometry (objective, allows to see lens and cornea components of astigmatism) and subjective refraction, but subjective methods are almost always inaccurate, if lens astigmatism is not fully removed first with a week of e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union College, New York
Union College is a private liberal arts college in Schenectady, New York. Founded in 1795, it was the first institution of higher learning chartered by the New York State Board of Regents, and second in the state of New York, after Columbia College (formerly King's College). In the 19th century, it became known as the "Mother of Fraternities",Somers (2003), p. 304 as three of the earliest Greek letter societies were established there. The school was once referred to as one of the " Big Four" alongside Harvard University, Yale University and Princeton University, before the Civil War and a financial scandal led to its fall from grace and the top national rankings. Union began enrolling women in 1970, after 175 years as an all-male institution. The college offers a liberal arts curriculum across 21 academic departments, as well as opportunities for interdepartmental majors and self-designed organizing theme majors. It offers a wide array of courses in the humanities, social s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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