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Corneal Tattooing
Corneal tattooing (or keratopigmentation) is the practice of tattooing the cornea of the human eye. Reasons for this practice include improvement of cosmetic appearance and the improvement of sight. Many different methods and procedures exist today, and there are varying opinions concerning the safety or success of this practice. Reasons for corneal tattooing Causes or reasons for corneal tattooing vary from patient to patient. Most patients receive treatment to alter the cosmetic appearance of their eyes following disease or accident. Others receive treatment for optical purposes, including decreasing circumstantial glare within the iris. Corneal opacities are the leading reason for undergoing cosmetic tattooing. Reconstructive cosmetic purposes The leading reason for corneal tattooing is to alter the appearance of the eye cosmetically. Usually, the need for this alteration stems from corneal opacity. Corneal opacities (scarring of the cornea that creates an opaque or semi-t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nutgall
Galls (from the Latin , 'oak-apple') or ''cecidia'' (from the Greek , anything gushing out) are a kind of swelling growth on the external tissues of plants, fungi, or animals. Plant galls are abnormal outgrowths of plant tissues, similar to benign tumors or warts in animals. They can be caused by various parasites, from viruses, fungi and bacteria, to other plants, insects and mites. Plant galls are often highly organized structures so that the cause of the gall can often be determined without the actual agent being identified. This applies particularly to some insect and mite plant galls. The study of plant galls is known as cecidology. In human pathology, a gall is a raised sore on the skin, usually caused by chafing or rubbing. Causes of plant galls Insects and mites Insect galls are the highly distinctive plant structures formed by some herbivorous insects as their own microhabitats. They are plant tissue which is controlled by the insect. Galls act as both the habitat a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corneal Ulcer
Corneal ulcer is an inflammatory or, more seriously, infective condition of the cornea involving disruption of its epithelial layer with involvement of the corneal Stroma of cornea, stroma. It is a common condition in humans particularly in the tropics and the agrarian societies. In developing countries, children afflicted by Vitamin A deficiency are at high risk for corneal ulcer and may become blind in both eyes, which may persist lifelong. In ophthalmology, a corneal ulcer usually refers to having an infectious cause while the term corneal abrasion refers more to physical abrasions. Types Superficial and deep corneal ulcers Corneal ulcers are a common human eye disease. They are caused by trauma, particularly with vegetable matter, as well as chemical injury, contact lenses and infections. Other eye conditions can cause corneal ulcers, such as entropion, distichiasis, corneal dystrophy, and keratoconjunctivitis sicca (dry eye). Many micro-organisms cause infective corneal ulc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iridocyclitis
Uveitis () is inflammation of the uvea, the pigmented layer of the eye between the inner retina and the outer fibrous layer composed of the sclera and cornea. The uvea consists of the middle layer of pigmented vascular structures of the eye and includes the iris, ciliary body, and choroid. Uveitis is described anatomically, by the part of the eye affected, as anterior, intermediate or posterior, or panuveitic if all parts are involved. Anterior uveitis ( iridocyclytis) is the most common, with the incidence of uveitis overall affecting approximately 1:4500, most commonly those between the ages of 20-60. Symptoms include eye pain, eye redness, floaters and blurred vision, and ophthalmic examination may show dilated ciliary blood vessels and the presence of cells in the anterior chamber. Uveitis may arise spontaneously, have a genetic component, or be associated with an autoimmune disease or infection. While the eye is a relatively protected environment, its immune mechanisms may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recurrent Corneal Erosion
Recurrent corneal erosion is a disorder of the eyes characterized by the failure of the cornea's outermost layer of epithelial cells to attach to the underlying basement membrane ( Bowman's layer). The condition is excruciatingly painful because the loss of these cells results in the exposure of sensitive corneal nerves. This condition can often leave patients with temporary blindness due to extreme light sensitivity (photophobia). Signs and symptoms Symptoms include recurring attacks of severe acute ocular pain, foreign-body sensation, photophobia (i.e. sensitivity to bright lights), and tearing often at the time of awakening or during sleep when the eyelids are rubbed or opened. Signs of the condition include corneal abrasion or localized roughening of the corneal epithelium, sometimes with map-like lines, epithelial dots or microcysts, or fingerprint patterns. An epithelial defect may be present, usually in the inferior interpalpebral zone. Cause Most cases of recurrent cornea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Black
Carbon black (subtypes are acetylene black, channel black, furnace black, lamp black and thermal black) is a material produced by the incomplete combustion of coal and coal tar, vegetable matter, or petroleum products, including fuel oil, fluid catalytic cracking tar, and ethylene cracking. Carbon black is a form of paracrystalline carbon that has a high surface-area-to-volume ratio, albeit lower than that of activated carbon. It is dissimilar to soot in its much higher surface-area-to-volume ratio and significantly lower (negligible and non-bioavailable) polycyclic aromatic hydrocarbon (PAH) content. However, carbon black can be used as a model compound for diesel soot to better understand how diesel soot behaves under various reaction conditions as carbon black and diesel soot have some similar properties such as particle sizes, densities, and copolymer adsorption abilities that contribute to them having similar behaviours under various reactions such as oxidation experiments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Gillott
Joseph Gillott (11 October 1799 – 5 January 1872) was an English pen-manufacturer and patron of the arts based in Birmingham. Pen manufacturing After a brief period of schooling, Gillott began working in the cutlery trade in his home town of Sheffield. In 1821 he moved to Birmingham, where he found employment in the steel toy trade, the technical name for the manufacture of steel buckles, chains and light ornamental steel-work generally. About 1830 he turned his attention to the manufacture of steel pens by machinery. His company rapidly became successful and Gillott was soon a very wealthy man. It was rumoured locally that he buried some of his money in his cellar so that it did not become known that he had acquired so much. He certainly spread his cash across a number of bank accounts in Birmingham. In 1840 he opened his Victoria Works; the business employed mainly girls. Gillott also invested in the new railway companies and especially in property and land – n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stroma Of Cornea
The stroma of the cornea (or substantia propria) is a fibrous, tough, unyielding, perfectly transparent and the thickest layer of the cornea of the eye. It is between Bowman's membrane anteriorly, and Descemet's membrane posteriorly. At its centre, human corneal stroma is composed of about 200 flattened ''lamellæ'' (layers of collagen fibrils), superimposed one on another. They are each about 1.5-2.5 μm in thickness. The anterior lamellæ interweave more than posterior lamellæ. The fibrils of each lamella are parallel with one another, but at different angles to those of adjacent lamellæ. The lamellæ are produced by keratocytes (corneal connective tissue cells), which occupy about 10% of the substantia propria. Apart from the cells, the major non-aqueous constituents of the stroma are collagen fibrils and proteoglycans. The collagen fibrils are made of a mixture of type I and type V collagens. These molecules are tilted by about 15 degrees to the fibril axis, and because of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victor Morax
Victor Morax, Paris, 1920 Victor Morax (16 March 1866 – 14 May 1935) was an ophthalmologist born in Morges, Switzerland. He studied in Freiburg (Germany) and Paris, and from 1891 to 1903, he worked at the Pasteur Institute in Paris. From 1903 to 1928, he was associated with the Hôpital Lariboisière, rejoining the Pasteur Institute as a permanent member in 1929. In 1930, he became a member of the Académie de Médecine. While at the Pasteur Institute, Morax discovered the bacillus '' Moraxella lacunata'', the cause of chronic conjunctivitis. The disease is sometimes referred to as either "Morax' disease" or as "Axenfeld's conjunctivitis", named after German ophthalmologist Theodor Axenfeld (1867-1930), who made his discovery of the bacillus during the same time period as did Morax. In 1923, he became vice-president of the "International League Against Trachoma" with bacteriologist Charles Nicolle (1866-1936) serving as its president. In 1929, he published a treatise on th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Pen
Thomas Edison's electric pen, part of a complete outfit for duplicating handwritten documents and drawings, was the first relatively safe electric-motor-driven office appliance produced and sold in the United States. Development Edison recognized the possible demand for a high speed copying device after observing the incredible amount of document duplication required of merchants, lawyers, insurance companies, and those of similar occupations."Thomas A. Edison Papers." Electric Pen - The Edison Papers. Rutgers, n.d. Web. 14 Feb. 2017. . To satisfy this demand, Edison invented the electric pen, which uses a perforating function inspired by the printing telegraph. Edison and his associate Charles Batchelor observed that as this device punctured the paper, a mark was left underneath by the chemical solution it utilized. Edison took advantage of this property and built the electric pen around it.Burns, Bill. "Edison’s Electric Pen." Edison’s Electric Pen. FTL Design, n.d. Web. 14 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cocaine
Cocaine (from , from , ultimately from Quechuan languages, Quechua: ''kúka'') is a central nervous system (CNS) stimulant mainly recreational drug use, used recreationally for its euphoria, euphoric effects. It is primarily obtained from the leaves of two Coca species native to South America, ''Erythroxylum coca'' and ''Erythroxylum novogranatense''. After extraction from coca leaves and further processing into cocaine hydrochloride (powdered cocaine), the drug is often Insufflation (medicine), snorted, applied topical administration, topically to the mouth, or dissolved and injection (medicine), injected into a vein. It can also then be turned into free base form (crack cocaine), in which it can be heated until sublimated and then the vapours can be smoking, inhaled. Cocaine stimulates the mesolimbic pathway, reward pathway in the brain. Mental effects may include an euphoria, intense feeling of happiness, sexual arousal, psychosis, loss of contact with reality, or psychomo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
