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Limbal Ring
A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral cornea. It has been suggested that limbal ring thickness may correlate with health or youthfulness and may contribute to facial attractiveness. The thickness of the limbal ring varies by pupil dilation: When the pupil is larger, the limbal ring narrows. Some contact lenses are colored to simulate limbal rings. Youth, health, and attractiveness Both health and youth are positively correlated with a prominent limbal ring. For instance, a darker limbal ring tends to be found more attractive than the absence of a limbal ring, suggesting that both sexes "use the limbal ring as a probabilistic indicator of reproductive fitness". Furthermore, limbal rin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Eye 2
Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The term ''blue'' generally describes colours perceived by humans observing light with a dominant wavelength that's between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called the Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective. Blue has been an important colour in art and decoration since ancient times. The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultrama ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Eye With Limbal Ring, Anterior View
Humans (''Homo sapiens'') or modern humans are the most common and widespread species of primate, and the last surviving species of the genus ''Homo''. They are Hominidae, great apes characterized by their Prehistory of nakedness and clothing#Evolution of hairlessness, hairlessness, bipedality, bipedalism, and high Human intelligence, intelligence. Humans have large Human brain, brains, enabling more advanced cognitive skills that facilitate successful adaptation to varied environments, development of sophisticated tools, and formation of complex social structures and civilizations. Humans are Sociality, highly social, with individual humans tending to belong to a Level of analysis, multi-layered network of distinct social groups — from families and peer groups to corporations and State (polity), political states. As such, social interactions between humans have established a wide variety of Value theory, values, norm (sociology), social norms, languages, and traditions (co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iris (anatomy)
The iris (: irides or irises) is a thin, annular structure in the eye in most mammals and birds that is responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm (optics), diaphragm. Eye color is defined by the iris. Etymology The word "iris" is derived from the Greek word for "rainbow", also Iris (mythology), its goddess plus messenger of the gods in the ''Iliad'', because of the many eye color, colours of this eye part. Structure The iris consists of two layers: the front pigmented Wikt:fibrovascular, fibrovascular layer known as a stroma of iris, stroma and, behind the stroma, pigmented epithelial cells. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds. ... [...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 eye containing mainly collagen and some crucial elastic fiber. 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. In humans, and some other vertebrates, the whole sclera is white or pale, contrasting with the coloured iris (anatomy), iris. The cooperative eye hypothesis suggests that the pale sclera evolved as a method of nonverbal communication that makes it easier for one individual to identify where another individual is looking. Other mammals with white or pale sclera include chimpanzees, many orangutans, some gorillas, and bon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 Refraction, refracts light, accounting for approximately two-thirds of the eye's total optical power. In humans, the refractive power of the cornea is approximately 43 dioptres. The cornea can be reshaped by surgical procedures such as LASIK. While the cornea contributes most of the eye's focusing power, its Focus (optics), focus is fixed. Accommodation (eye), Accommodation (the refocusing of light to better view near objects) is accomplished by changing the geometry of the lens. Medical terms related to the cornea often start with the prefix "''wikt:kerat-, kerat-''" from the Ancient Greek, Greek word κέρας, ''horn''. Structure The cornea has myelinated, unmyelinated nerve endings sensitive to touch, temperature and chemicals; a to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johnson And Johnson
Johnson & Johnson (J&J) is an American Multinational corporation, multinational Pharmaceutical industry, pharmaceutical, biotechnology, and Medical device, medical technologies corporation headquartered in New Brunswick, New Jersey, and publicly traded on the New York Stock Exchange. Its common stock is a component of the Dow Jones Industrial Average, and the company is ranked No. 42 on the 2024 Fortune 500, ''Fortune'' 500 list of the largest United States corporations. In 2024, the company was ranked 45th in the Forbes Global 2000, ''Forbes'' Global 2000. Johnson & Johnson has a global workforce of approximately 138,000 employees who are led by the company's current chairman and chief executive officer, Joaquin Duato. Johnson & Johnson was founded in 1886 by three brothers, Robert Wood Johnson I, Robert Wood Johnson, James Wood Johnson, and Edward Mead Johnson, selling ready-to-use sterile surgical dressings. In 2023, the company split-off its consumer healthcare business se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corneal Limbus
The corneal limbus (''Latin'': corneal border) is a highly vascularized and pigmented zone between the cornea, conjunctiva, and the sclera (the white of the eye) that protects and heals the cornea. The cornea is composed of three primary cell types: epithelial cells, corneal fibroblasts, and endothelial cells. The corneal surface is one of the body's most specialized structures that undergoes continuous cellular renewal and regeneration. It contains limbal epithelial stem cells (LESCs) in the palisades of Vogt. Limbal stem cell deficiency (LSCD) can lead to disorders where limbal stem cells are damaged or absent. Additional disorders involving the corneal limbus are caused by deficiencies in interactions between ocular structures, developmental anomalies, and cancer. This article explores the structure, functions, disorders, and clinical significance of the corneal limbus. Etymology The word "limbus" comes from the Latin meaning "border." Structure The corneal limbus is th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optometry And Vision Science
''Optometry and Vision Science'' is a monthly peer-reviewed medical journal published by Lippincott Williams & Wilkins on behalf of the American Academy of Optometry. The journal was established in 1924 as the ''American Journal of Optometry''. It was renamed the ''American Journal of Optometry and Archives of the American Academy of Optometry'' in 1941, then to the ''American Journal of Optometry and Physiological Optics'' in 1974, before obtaining its current title in 1989. The editor-in-chief is Michael D. Twa of the University of Alabama at Birmingham. Abstracting and indexing The journal is abstracted and indexed in Index Medicus/ MEDLINE/ PubMed, the Science Citation Index, and Current Contents/Clinical Medicine. According to the ''Journal Citation Reports'', the journal has a 2012 impact factor of 1.895. Garland W. Clay Award This award is given to the authors of the article published by the journal that has been most widely cited in the world of scientific liter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolutionary Psychology (journal)
''Evolutionary Psychology'' is a peer-reviewed open access academic journal published since 2003. It covers empirical, philosophical, historical, and socio-political aspects of evolutionary psychology. Its editors-in-chief are Todd K. Shackelford (Oakland University), Bernhard Fink (University of Göttingen), David A. Puts (Pennsylvania State University), and Rebecca Sear ( London School of Hygiene and Tropical Medicine). In 2015 the journal moved to SAGE Publications. The journal is abstracted and indexed in Social Sciences Citation Index, and Current Contents ''Current Contents'' is a rapid alerting service database from Clarivate, formerly the Institute for Scientific Information and Thomson Reuters. It is published online and in several different printed subject sections. History ''Current Contents .../Social and Behavioral Sciences. References External links * (previously at EPjournal.Net) English-language journals Academic journals established in 2003 Qua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contact Lens
Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to correct vision or for cosmetic or therapeutic reasons. In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion.Nichols, Jason J., et a"ANNUAL REPORT: Contact Lenses 2010" January 2011. Multiple analysts estimated that the global market for contact lenses would reach $11.7 billion by 2015. the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female.Morgan, Philip B., et al"International Contact Lens Prescribing in 2010" ''Contact Lens Spectrum''. October 2011. People choose to wear contact lenses for many reasons. Aesthetics and cosmetics are main motivating factors for people who want to avoid wearing glasses or to change the appearance or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eye Central Heterochromia Crop And Lighter
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 eye is a complex optical system that 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 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, classified into compound eyes and non-compound eyes. Compound eyes are made up of multiple small visual units, and are common on insects and crustaceans. Non-compound eyes have a single lens and focus light onto the retina to form a single image. This type of eye i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Personality And Social Psychology Bulletin
''Personality and Social Psychology Bulletin'' is a scientific journal published monthly published by SAGE Publications for the Society for Personality and Social Psychology (SPSP). The journal's senior editorial team include: Editor Michael D. Robinson ( North Dakota State University), Co-Editor Yuen J. Huo (University of California, Los Angeles), Co-Editor Emily A. Impett (University of Toronto) and Co-Editor Benjamin M. Wilkowski (University of Wyoming). This journal is a member of the Committee on Publication Ethics (COPE). Abstracting and indexing ''Personality and Social Psychology Bulletin'' is abstracted and indexed in MEDLINE, Scopus and the Social Sciences Citation Index. According to Thomson Reuters 2019 ''Journal Citation Reports ''Journal Citation Reports'' (''JCR'') is an annual publication by Clarivate. It has been integrated with the Web of Science and is accessed from the Web of Science Core Collection. It provides information about academic journals in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
