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Polycoria
Polycoria is a pathological condition of the eye characterized by more than one pupillary opening in the iris.Cassin, B. and Solomon, S. ''Dictionary of Eye Terminology''. Gainesville, Florida: Triad Publishing Company, 1990. It may be congenital or result from a disease affecting the iris. It results in decreased function of iris and pupil, affecting the physical eye and visualization. In the early history of China, double pupils were seen as a sign that a child would become a great king or sage. Epidemiology Polycoria is extremely rare, and other conditions are frequently mistaken for it. Polycoria is often congenital, however not diagnosed until adulthood. The general cause of polycoria is unknown, but there are some other eye conditions that are in association with polycoria. These include (although not often) polar cataracts, glaucoma, abnormally long eyelashes, abnormal eye development, and poor vision. There have been cases diagnosed from age 3 to adulthood. The prevale ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xiang Yu
Xiang Yu (, –202 BC), born Xiang Ji (), was the Hegemon-King (Chinese: 霸王, ''Bà Wáng'') of Western Chu during the Chu–Han Contention period (206–202 BC) of China. A noble of the Chu state, Xiang Yu rebelled against the Qin dynasty and became a prominent warlord. He was granted the title of "Duke of Lu" () by King Huai II of the restoring Chu state in 208 BC. The following year, he led the Chu forces to victory at the Battle of Julu against the Qin armies led by Zhang Han. After the fall of Qin, Xiang Yu was enthroned as the "Hegemon-King of Western Chu" () and ruled a vast area covering modern-day central and eastern China, with Pengcheng as his capital. He engaged Liu Bang, the founding emperor of the Han dynasty, in a long struggle for power, known as the Chu–Han Contention, which concluded with his eventual defeat at the Battle of Gaixia and his suicide. Xiang Yu is depicted in the Wu Shuang Pu (, Table of Peerless Heroes) by Jin Guliang. Names and titles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Eye
The human eye is a sensory organ, part of the sensory nervous system, that reacts to visible light and allows humans to use visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm. The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer layers, such as the outermost, white part of the eye (the sclera) and one of its inner layers (the pigmented choroid) keeping the eye essentially light tight except on the eye's optic axis. In order, along the optic axis, the optical components consist of a first lens (the cornea—the clear part of the eye) that accomplishes most of the focussing of light from the outside world; then an aperture (the pupil) in a diaphragm (the iris—the coloured part of the eye) that controls the amount of light entering the interior of the eye; then another lens (the crystalline lens) that accomplishes the remaining focussing of light into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sclera
The sclera, also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some crucial elastic fiber. In humans, and some other vertebrates, the whole sclera is white, contrasting with the coloured iris, but in most mammals, the visible part of the sclera matches the colour of the iris, so the white part does not normally show while other vertebrates have distinct colors for both of them. In the development of the embryo, the sclera is derived from the neural crest. In children, it is thinner and shows some of the underlying pigment, appearing slightly blue. In the elderly, fatty deposits on the sclera can make it appear slightly yellow. People with dark skin can have naturally darkened sclerae, the result of melanin pigmentation. The human eye is relatively rare for having a pale sclera (relative to the iris). This makes it easier for one individual to ide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eye Injury
Eyes are organs of the visual system. They provide living organisms with vision, the ability to receive and process visual detail, as well as enabling several photo response functions that are independent of vision. Eyes detect light and convert it into electro-chemical impulses in neurons (neurones). In higher organisms, the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in molluscs, chordates and arthropods. The most simple eyes, pit eyes, are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chu–Han Contention
The Chu–Han Contention ( zh, , lk=on) or Chu–Han War () was an interregnum period in ancient China between the fallen Qin dynasty and the subsequent Han dynasty. After the third and last Qin ruler, Ziying, unconditionally surrendered to rebel forces in 206 BCE, the former Qin Empire was divided by rebel leader Xiang Yu into the Eighteen Kingdoms, which were ruled by various rebel leaders and surrendered Qin generals. A civil war soon broke out, most prominently between two major contending powers – Xiang Yu's Western Chu and Liu Bang's Han. Some of the other kingdoms also waged war among themselves but these were largely insignificant compared to the main conflict between Chu and Han. The war ended in 202 BCE with a total Han victory at the Battle of Gaixia, where Xiang Yu fled to Wujiang and committed suicide after a violent last stand. Liu Bang subsequently proclaimed himself Emperor and established the Han dynasty as the ruling dynasty of China. Background In 22 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hangzhou
Hangzhou ( or , ; , , Standard Mandarin pronunciation: ), also romanized as Hangchow, is the capital and most populous city of Zhejiang, China. It is located in the northwestern part of the province, sitting at the head of Hangzhou Bay, which separates Shanghai and Ningbo. Hangzhou grew to prominence as the southern terminus of the Grand Canal and has been one of China's most renowned and prosperous cities for much of the last millennium. It is a major economic and e-commerce hub within China, and the second biggest city in Yangtze Delta after Shanghai. Hangzhou is classified as a sub-provincial city and forms the core of the Hangzhou metropolitan area, the fourth-largest in China after Guangzhou-Shenzhen Pearl River agglomeration, Shanghai-Suzhou-Wuxi-Changzhou conurbation and Beijing. As of 2019, the Hangzhou metropolitan area was estimated to produce a gross metropolitan product (nominal) of 3.2 trillion yuan ($486.53 billion), making it larger than the economy of Nigeri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qin Dynasty
The Qin dynasty ( ; zh, c=秦朝, p=Qín cháo, w=), or Ch'in dynasty in Wade–Giles romanization ( zh, c=, p=, w=Ch'in ch'ao), was the first Dynasties in Chinese history, dynasty of Imperial China. Named for its heartland in Qin (state), Qin state (modern Gansu and Shaanxi), the Qin dynasty arose as a fief of the Western Zhou and endured for over five centuries until 221 BCE when it founded its brief empire, which lasted only until 206 BCE. It often causes confusion that the ruling family of the Qin kingdom (what is conventionally called a "dynasty") ruled for over five centuries, while the "Qin Dynasty," the conventional name for the first Chinese empire, comprises the last fourteen years of Qin's existence. The divide between these two periods occurred in 221 BCE when King Zheng of Qin declared himself the Qin Shi Huang, First Emperor of Qin, though he had already been king of Qin since 246 BCE. Qin was a minor power for the early centuries of its existence. The streng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Han Dynasty
The Han dynasty (, ; ) was an imperial dynasty of China (202 BC – 9 AD, 25–220 AD), established by Liu Bang (Emperor Gao) and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–207 BC) and a warring interregnum known as the ChuHan contention (206–202 BC), and it was succeeded by the Three Kingdoms period (220–280 AD). The dynasty was briefly interrupted by the Xin dynasty (9–23 AD) established by usurping regent Wang Mang, and is thus separated into two periods—the Western Han (202 BC – 9 AD) and the Eastern Han (25–220 AD). Spanning over four centuries, the Han dynasty is considered a golden age in Chinese history, and it has influenced the identity of the Chinese civilization ever since. Modern China's majority ethnic group refers to themselves as the "Han people", the Sinitic language is known as "Han language", and the written Chinese is referred to as "Han characters". The emperor was at the pinnacle of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emperor Gaozu Of Han
Emperor Gaozu of Han (256 – 1 June 195 BC), born Liu Bang () with courtesy name Ji (季), was the founder and first emperor of the Han dynasty, reigning in 202–195 BC. His temple name was "Taizu" while his posthumous name was Emperor Gao, or Gaodi; "Gaozu of Han", derived from the ''Records of the Grand Historian'', is the common way of referring to this sovereign even though he was not accorded the temple name "Gaozu", which literally means "High Founder". Liu Bang was one of the few dynasty founders in Chinese history who was born into a peasant family. Prior to coming to power, Liu Bang initially served for the Qin dynasty as a minor law enforcement officer in his home town Pei County, within the conquered state of Chu. With the First Emperor's death and the Qin Empire's subsequent political chaos, Liu Bang renounced his civil service position and became an anti-Qin rebel leader. He won the race against fellow rebel leader Xiang Yu to invade the Qin heartlan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chu (state)
Chu, or Ch'u in Wade–Giles romanization, (, Hanyu Pinyin: Chǔ, Old Chinese: ''*s-r̥aʔ'') was a Zhou dynasty vassal state. Their first ruler was King Wu of Chu in the early 8th century BCE. Chu was located in the south of the Zhou heartland and lasted during the Spring and Autumn period. At the end of the Warring States period it was destroyed by the Qin in 223 BCE during the Qin's wars of unification. Also known as Jing () and Jingchu (), Chu included most of the present-day provinces of Hubei and Hunan, along with parts of Chongqing, Guizhou, Henan, Anhui, Jiangxi, Jiangsu, Zhejiang, and Shanghai. For more than 400 years, the Chu capital Danyang was located at the junction of the Dan and Xi Rivers near present-day Xichuan County, Henan, but later moved to Ying. The house of Chu originally bore the clan name Nai ( OC: /*rneːlʔ/) which was later written as Mi ( OC: /*meʔ/). They also bore the lineage name Yan ( OC: /*qlamʔ/, /*qʰɯːm/) which would later ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Axenfeld Syndrome
Axenfeld or Aksenfeld may refer to: * Israel Aksenfeld (aka Israel Axenfeld / Yisroel Aksenfeld, 1787-1866), a German writer * Karl Theodor Paul Polykarpus Axenfeld (1867-1930), a German ophthalmologist * Karl Theodor Georg Axenfeld (1869-1924), a German superintendent of the Kurmark *Edith Picht-Axenfeld Edith Picht-Axenfeld (Freiburg im Breisgau, 1 January 1914 – Hinterzarten, 19 April 2001) was a German pianist and harpsichordist. Career She started her concert career in 1935, and took part two years later in the III International Chopin Pian ... (1914-2001), a German pianist and harpsichordist * Morax-Axenfeld diplobacilli, a bacterium * Axenfeld syndrome, a rare autosomal dominant disorder {{disamb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ectoderm
The ectoderm is one of the three primary germ layers formed in early embryonic development. It is the outermost layer, and is superficial to the mesoderm (the middle layer) and endoderm (the innermost layer). It emerges and originates from the outer layer of germ cells. The word ectoderm comes from the Greek ''ektos'' meaning "outside", and ''derma'' meaning "skin".Gilbert, Scott F. Developmental Biology. 9th ed. Sunderland, MA: Sinauer Associates, 2010: 333-370. Print. Generally speaking, the ectoderm differentiates to form epithelial and neural tissues (spinal cord, peripheral nerves and brain). This includes the skin, linings of the mouth, anus, nostrils, sweat glands, hair and nails, and tooth enamel. Other types of epithelium are derived from the endoderm. In vertebrate embryos, the ectoderm can be divided into two parts: the dorsal surface ectoderm also known as the external ectoderm, and the neural plate, which invaginates to form the neural tube and neural crest. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
