53-598: Megane ( 眼鏡 ) is the Japanese word for eyeglasses . It may refer to: Megane (film) , a 2007 comedy film by Naoko Ogigami Megane (Urusei Yatsura) , an anime character Megane Bridge , a bridge in Nagasaki, Nagasaki, Japan Meganebashi, a bridge in Isahaya Park , Japan Leila Megàne (1891–1960), a Welsh opera singer (born Margaret Jones) Renault Mégane ,
106-455: A diffraction limited system, which has an increased depth of field, similar to using a small aperture in photography. This form of correction has many limitations that prevent it from gaining popularity in everyday use. Pinhole glasses can be made in a DIY fashion by making small holes in a piece of card which is then held in front of the eyes with a strap or cardboard arms. Glasses may also house other corrective or assistive devices. After
159-410: A circular lens called a lens blank. Lens blanks are cut to fit the shape of the frame that will hold them. Frame styles vary and fashion trends change over time, resulting in a multitude of lens shapes. For lower power lenses, there are few restrictions, allowing for many trendy and fashionable shapes. Higher power lenses can distort peripheral vision and may become thick and heavy if a large lens shape
212-529: A full-sized welding helmet is inconvenient or uncomfortable. These are often called "flash goggles" because they provide protection from welding flash. Nylon frames are usually used for protective eyewear for sports because of their lightweight and flexible properties. Unlike most regular glasses, safety glasses often include protection beside the eyes as well as in front of the eyes. Sunglasses provide more comfort and protection against bright light and often against ultraviolet (UV) light. To properly protect
265-479: A medical symptom, photophobia is not a morbid fear or phobia , but an experience of discomfort or pain to the eyes due to light exposure or by presence of actual physical sensitivity of the eyes, though the term is sometimes additionally applied to abnormal or irrational fear of light, such as heliophobia . The term photophobia comes from Greek φῶς (phōs) 'light' and φόβος (phóbos) 'fear'. Patients may develop photophobia as
318-455: A person to "ride out the migraine" in a dark or dim room. A paper by Stringham and Hammond, published in the Journal of Food Science , reviews studies of effects of consuming Lutein and Zeaxanthin on visual performance, and notes a decrease in sensitivity to glare. Photophobia may preclude or limit a person from working in places where lighting is used, unless the person is able to obtain
371-480: A recent ophthalmic prescription are required. People who need glasses to see often have corrective lens restrictions on their driver's licenses that require them to wear their glasses every time they drive or risk fines or jail time. Some militaries issue prescription glasses to servicemen and women. These are typically GI glasses . Many state prisons in the United States issue glasses to inmates, often in
424-534: A result of several different medical conditions, related to the eye , the nervous system , genetic, or other causes. Photophobia may manifest itself in an increased response to light starting at any step in the visual system , such as: Common causes of photophobia include migraine headaches , TMJ , cataracts , Sjögren syndrome , mild traumatic brain injury ( MTBI ), or severe ophthalmologic diseases such as uveitis or corneal abrasion . A more extensive list follows: Causes of photophobia relating directly to
477-432: A separate set of glasses for focusing on close by objects. Reading glasses are available without prescription from drugstores , and offer a cheap, practical solution, though these have a pair of simple lenses of equal power, and so will not correct refraction problems like astigmatism or refractive or prismatic variations between the left and right eye. For the total correction of the individual's sight, glasses complying to
530-655: A small family car produced by the French automaker Renault See also [ edit ] Megan (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Megane . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Megane&oldid=1246344475 " Category : Disambiguation pages Hidden categories: Articles containing Japanese-language text Short description
583-650: A wide range of fashions are available, using plastic, metal, wire, and other materials for frames. Glasses can be marked or found by their primary function, but also appear in combinations such as prescription sunglasses or safety glasses with enhanced magnification. Corrective lenses are used to correct refractive errors by bending the light entering the eye in order to alleviate the effects of conditions such as nearsightedness (myopia) , farsightedness (hypermetropia) or astigmatism . The ability of one's eyes to accommodate their focus to near and distant focus alters over time. A common condition in people over forty years old
SECTION 10
#1732800965358636-404: Is presbyopia , which is caused by the eye's crystalline lens losing elasticity, progressively reducing the ability of the lens to accommodate (i.e. to focus on objects close to the eye). Few people have a pair of eyes that show exactly equal refractive characteristics; one eye may need a "stronger" (i.e. more refracting) lens than the other. Corrective lenses bring the image back into focus on
689-455: Is "single vision", which has a uniform refractive index . For people with presbyopia and hyperopia , bifocal and trifocal glasses provide two or three different refractive indices, respectively, and progressive lenses have a continuous gradient. Lenses can also be manufactured with high refractive indices, which allow them to be more lightweight and thinner than their counterparts with "low" refractive indices. Reading glasses provide
742-413: Is also known to have written on the magnifying properties of lenses. The development of the first eyeglasses took place in northern Italy in the second half of the 13th century. Independently of the development of optical lenses, some cultures developed " sunglasses " for eye protection, without any corrective properties. For example, flat panes of smoky quartz were used in 12th-century China , and
795-408: Is different from Wikidata All article disambiguation pages All disambiguation pages Eyeglasses Glasses , also known as eyeglasses and spectacles , are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes , typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over
848-517: Is filtered so that each eye receives a slightly different image. The filters only work for the type of signal they were designed for. Anaglyph 3D glasses have a different colored filter for each eye, typically red and blue or red and green. A polarized 3D system on the other hand uses polarized filters. Polarized 3D glasses allow for color 3D, while the red-blue lenses produce an image with distorted coloration. An active shutter 3D system uses electronic shutters . Head-mounted displays can filter
901-470: Is mistakenly claimed to have encountered eyeglasses during his travels in China in the 13th century. However, no such evidence appears in his accounts. Indeed, the earliest mentions of eyeglasses in China occur in the 15th century and those Chinese sources state that eyeglasses were imported. Photophobia Photophobia is a medical symptom of abnormal intolerance to visual perception of light . As
954-439: Is no measurable UV light from computer monitors. The problem of computer vision syndrome (CVS) can result from focusing the eyes on a screen for long, continuous periods. Many times the glasses do not appear to have much of a tint, or, if any, a slight yellow tint, but they may be more heavily tinted. Long hours of computer use (not blue light) may cause eye strain. Many eye symptoms caused by computer use will lessen after
1007-404: Is not yet twenty years since there was found the art of making eyeglasses, which make for good vision ... And it is so short a time that this new art, never before extant, was discovered. ... I saw the one who first discovered and practiced it, and I talked to him." Giordano's colleague Friar Alessandro della Spina of Pisa (d. 1313) was soon making eyeglasses. The Ancient Chronicle of
1060-404: Is used. However, if the lens is too small, it can drastically reduce the field of view. Bifocal , trifocal , and progressive lenses generally require a taller lens shape to leave room for the different segments while preserving an adequate field of view through each segment. Frames with rounded edges are the most efficient for correcting myopic prescriptions, with perfectly round frames being
1113-454: The College of Optometrists (UK) is that "the best scientific evidence currently available does not support the use of blue-blocking spectacle lenses in the general population to improve visual performance, alleviate the symptoms of eye fatigue or visual discomfort, improve sleep quality or conserve macula health." The ophthalmic frame is the part of a pair of glasses that is designed to hold
SECTION 20
#17328009653581166-635: The Inuit have used snow goggles for eye protection. The earliest recorded comment on the use of lenses for optical purposes was made in 1268 by Roger Bacon . The first eyeglasses were estimated to have been made in Central Italy , most likely in Pisa or Florence , by about 1290: In a sermon delivered on 23 February 1306, the Dominican friar Giordano da Pisa ( c. 1255 –1311) wrote "It
1219-457: The "night mode" of different operating systems, which can usually be activated outside of nighttime hours. The American Academy of Ophthalmology (AAO) does not recommend special eyewear for computer use, although it recommends using prescription glasses measured specifically for computer screen distance (depending on individuals, but possibly 20–26 inches from the face), which are not the same as "blue-light blocking" glasses. The position of
1272-533: The 12th century, coinciding with the development of " reading stones ". There are claims that single lens magnifying glasses were being used in China during the Northern Song dynasty (960–1127). Robert Grosseteste 's treatise De iride ( On the Rainbow ), written between 1220 and 1235, mentions using optics to "read the smallest letters at incredible distances". A few years later in 1262, Roger Bacon
1325-526: The 1930s to assist people bedbound by chronic illness or spinal injury, recumbent glasses have more recently been marketed not simply as an assistive device but also as 'lazy glasses'. They do not assist with vision, although they can be worn over regular corrective glasses. Yellow-tinted glasses are a type of glasses with a minor yellow tint. They perform a slight color correction, on top of reducing eyestrain from lack of blinking. They may also be considered minor corrective non-prescription glasses. Depending on
1378-593: The Dominican Monastery of St. Catherine in Pisa records: "Eyeglasses, having first been made by someone else, who was unwilling to share them, he [Spina] made them and shared them with everyone with a cheerful and willing heart." Venice quickly became an important center of manufacture, especially due to using the high-quality glass made at Murano . By 1301, there were guild regulations in Venice governing
1431-408: The basic fixed frame with another pair of lenses (optional), that are connected by four-bar linkage . For example, sun lenses could be easily lifted up and down while mixed with myopia lenses that always stay on. Presbyopia lenses could be also combined and easily removed from the field of view if needed without taking off glasses. These glasses are often used for drivers going through tunnels, with
1484-517: The cardinal Hugh de Saint-Cher reading in a scriptorium . Another early example would be a depiction of eyeglasses found north of the Alps in an altarpiece of the church of Bad Wildungen , Germany, in 1403. These early glasses had convex lenses that could correct both hyperopia (farsightedness), and the presbyopia that commonly develops as a symptom of aging . Although concave lenses for myopia (near-sightedness) had made their first appearance in
1537-764: The company, these computer or gaming glasses can also filter out high energy blue and ultra-violet light from LCD screens , fluorescent lighting , and other sources of light. This allows for reduced eye-strain. These glasses can be ordered as standard or prescription lenses that fit into standard optical frames. By the end of the 2010s, eyeglasses that filter out blue light from computers , smartphones and tablets are becoming increasingly popular in response to concerns about problems caused by blue light overexposure. The problems claimed range from dry eyes to eye strain , sleep cycle disruption, up to macular degeneration which can cause partial blindness. They may also block out ultraviolet (UV) radiation. However, there
1590-434: The corrective glass and improve aesthetic appearance (mini telescopic spectacles). They may take the form of self-contained glasses that resemble goggles or binoculars , or may be attached to existing glasses. Recumbent or prism glasses are glasses that use a prism with a 90° refraction to allow the wearer to read or view a screen while lying on their back. Developed by Liverpudlian ophthalmologist Andrew McKie Reid in
1643-466: The development of the transistor in the 1940s, combined eyeglass-hearing aids became popular. With thick-rimmed glasses the fashion at the time, a hearing aid could be concealed in the temple part of the frame. These fell out of fashion after the 1970s, but there are still occasions when combined eyeglass-hearing aids may be useful. Safety glasses are worn to protect the eyes in various situations. They are made with break-proof plastic lenses to protect
Megane - Misplaced Pages Continue
1696-402: The ears. Glasses are typically used for vision correction , such as with reading glasses and glasses used for nearsightedness ; however, without the specialized lenses, they are sometimes used for cosmetic purposes. Safety glasses provide eye protection against flying debris for construction workers or lab technicians; these glasses may have protection on the sides of the eyes as well as in
1749-615: The eye from flying debris or other matter. Construction workers, factory workers, machinists and lab technicians are often required to wear safety glasses to shield the eyes from flying debris or hazardous splatters such as blood or chemicals. As of 2017, dentists and surgeons in Canada and other countries are required to wear safety glasses to protect against infection from patients' blood or other body fluids. There are also safety glasses for welding , which are styled like wraparound sunglasses, but with much darker lenses, for use in welding where
1802-596: The eye itself include: Neurological causes for photophobia include: Treatment for light sensitivity addresses the underlying cause, whether it be an eye, nervous system or other cause. If the triggering factor or underlying cause can be identified and treated, photophobia may disappear. Tinted glasses are sometimes used. People with photophobia may feel eye pain from even moderate levels of artificial light and avert their eyes from artificial light sources. Ambient levels of artificial light may also be intolerable to persons afflicted with photophobia such that they dim or remove
1855-455: The eyes from the dangers of UV light, sunglasses should have UV-400 blocker to provide good coverage against the entire light spectrum that poses a danger. Light polarization is an added feature that can be applied to sunglass lenses. Polarization filters are positioned to remove horizontally polarized rays of light, which eliminates glare from horizontal surfaces (allowing wearers to see into water when reflected light would otherwise overwhelm
1908-568: The floorboards at Kloster Wienhausen , a convent near Celle in Germany; they have been dated to circa 1400. The world's first specialist shop for spectacles—what we might regard today as an optician —opened in Strasbourg (then Holy Roman Empire , now France) in 1466. The 17th-century claim by Francesco Redi that Salvino degli Armati of Florence invented eyeglasses in the 13th century has been exposed as erroneous. Marco Polo
1961-414: The form of clear plastic aviators. Adjustable-focus eyeglasses might be used to replace bifocals or trifocals, or might be used to produce cheaper single-vision glasses (since they do not have to be custom-manufactured for every person). Pinhole glasses are a type of corrective glasses that do not use a lens. Pinhole glasses do not actually refract the light or change focal length. Instead, they create
2014-492: The glasses. Sunglasses allow for better vision in bright daylight and are used to protect one's eyes against damage from excessive levels of ultraviolet light . Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in
2067-463: The lenses in the proper position. Ophthalmic frames come in a variety of styles, sizes, materials, shapes, and colors. Various metals and alloys may be used to make glasses, such as gold, silver, aluminum, beryllium , stainless steel , titanium , Monel , and nickel titanium . Natural materials such as wood, bone, ivory, leather and semi-precious or precious stones may also be used. Corrective lenses can be produced in many different shapes from
2120-419: The lenses. Some types of safety glasses are used to protect against visible and near-visible light or radiation . Glasses are worn for eye protection in some sports, such as squash . Glasses wearers may use a strap to prevent the glasses from falling off. Wearers of glasses that are used only part of the time may have the glasses attached to a cord that goes around their neck to prevent the loss and breaking of
2173-495: The lenses; however, special prescription sunglasses can be made. People with conditions that have photophobia as a primary symptom (like certain migraine disorders) often wear sunglasses or precision tinted glasses, even indoors and at night. Specialized glasses may be used for viewing specific visual information, for example, 3D glasses for 3D films ( stereoscopy ). Sometimes glasses are worn purely for fashion or aesthetic purposes. Even with glasses used for vision correction,
Megane - Misplaced Pages Continue
2226-473: The light more tolerable. Sunglasses may also have corrective lenses, which requires a prescription. Clip-on sunglasses or sunglass clips can be attached to another pair of glasses. Some wrap-around sunglasses are large enough to be worn over another pair of glasses. Otherwise, many people opt to wear contact lenses to correct their vision so that standard sunglasses can be used. The double frame uplifting glasses have one moving frame with one pair of lenses and
2279-400: The light source, or go into a dimmer lit room, such a one lit by refraction of light from outside the room. Alternatively, they may wear dark sunglasses , sunglasses designed to filter peripheral light, precision tinted glasses, and/or wide-brimmed sun hats or baseball caps . Some types of photophobia may be helped with the use of precision tinted lenses which block the green-to-blue end of
2332-492: The light spectrum without blurring or impeding vision. Other strategies for relieving photophobia include the use of tinted contact lenses and/or the use of prescription eye drops that constrict the pupil, thus reducing the amount of light entering the eye. Such strategies may be limited by the amount of light needed for proper vision under given conditions, however. Dilating drops may also help relieve eye pain from muscle spasms or seizures triggered by lighting/migraine, allowing
2385-406: The mid-15th century, it was not until 1604 that Johannes Kepler published the first correct explanation as to why convex and concave lenses could correct presbyopia and myopia. Early frames for glasses consisted of two magnifying glasses riveted together by the handles so that they could grip the nose. These are referred to as "rivet spectacles". The earliest surviving examples were found under
2438-534: The most efficient. Before the advent of eyeglasses as a fashion item, when frames were constructed with only functionality in mind, virtually all eyeglasses were either round , oval , panto, rectangular , octagonal , or square . It was not until glasses began to be seen as an accessory that different shapes were introduced to be more aesthetically pleasing than functional. Scattered evidence exists for use of visual aid devices in Greek and Roman times, most prominently
2491-460: The retina. They are made to conform to the prescription of an ophthalmologist or optometrist . A lensmeter can be used to verify the specifications of an existing pair of glasses. Corrective eyeglasses can significantly improve the life quality of the wearer. Not only do they enhance the wearer's visual experience, but can also reduce problems that result from eye strain, such as headaches or squinting. The most common type of corrective lens
2544-423: The sale of eyeglasses and a separate guild of Venetian spectacle makers was formed in 1320. In the fourteenth century, they were very common objects: Francesco Petrarca says in one of his letters that, until he was 60, he did not need glasses, and Franco Sacchetti mentions them often in his Trecentonovelle . The earliest pictorial evidence for the use of eyeglasses is Tommaso da Modena 's 1352 portrait of
2597-639: The scene). Polarized sunglasses may present some difficulties for pilots since reflections from water and other structures often used to gauge altitude may be removed. Liquid-crystal displays emit polarized light, making them sometimes difficult to view with polarized sunglasses. Sunglasses may be worn for aesthetic purposes, or simply to hide the eyes. Examples of sunglasses that were popular for these reasons include tea shades and mirrorshades . Many blind people wear nearly opaque glasses to hide their eyes for cosmetic reasons. Many people with light sensitivity conditions wear sunglasses or other tinted glasses to make
2650-681: The signal electronically and then transmit light directly into the viewer's eyes. Anaglyph and polarized glasses are distributed to audiences at 3D movies . Polarized and active shutter glasses are used with many home theaters. Head-mounted displays are used by a single person, but the input signal can be shared between multiple units. Glasses can also provide magnification that is useful for people with vision impairments or specific occupational demands. An example would be bioptics or bioptic telescopes which have small telescopes mounted on, in, or behind their regular lenses. Newer designs use smaller lightweight telescopes, which can be embedded into
2703-423: The upper frame serving as sunglasses and the second frame as transparent lenses. The illusion of three dimensions on a two-dimensional surface can be created by providing each eye with different visual information. 3D glasses create the illusion of three dimensions by filtering a signal containing information for both eyes. The signal, often light reflected off a movie screen or emitted from an electronic display,
SECTION 50
#17328009653582756-430: The usage of the computer is stopped. Decreasing evening screen time and setting devices to night mode will improve sleep. Several studies have shown that blue light from computers does not lead to eye diseases, including macular degeneration. The total amount of light entering the eyes can be adjusted without glasses using the screen brightness settings. Similarly, the blue light can often specifically be adjusted using
2809-657: The use of an emerald by Emperor Nero as mentioned by Pliny the Elder . The use of a convex lens to form an enlarged/magnified image was most likely described in Ptolemy 's Optics (which survives only in a poor Arabic translation). Ptolemy's description of lenses was commented upon and improved by Ibn Sahl (10th century) and most notably by Alhazen ( Book of Optics , c. 1021 ). Latin translations of Ptolemy's Optics and of Alhazen became available in Europe in
#357642