A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate , or another plastic . Glass lenses use visible light to darken. They are principally used in glasses that are dark in bright sunlight, but clear, or more rarely, lightly tinted in low ambient light conditions. They darken significantly within about a minute of exposure to bright light and take somewhat longer to clear. A range of clear and dark transmittances is available.
41-504: [REDACTED] Look up transition , transitate , transitional , transitionally , or transitions in Wiktionary, the free dictionary. Transition or transitional may refer to: Mathematics, science, and technology [ edit ] Biology [ edit ] Transition (genetics) , a point mutation that changes a purine nucleotide to another purine (A ↔ G) or
82-404: A Trace Music [ edit ] Transition (music) , the middle passage of a piece of music Transition (band) , English indie rock band Albums [ edit ] Transition (John Coltrane album) , 1970 Transition (The First Edition album) , 1971 Transition (Buddy Rich Lionel Hampton album) , 1974 Transition (John Miles album) , 1985 Transition (Fly to
123-404: A Trace Music [ edit ] Transition (music) , the middle passage of a piece of music Transition (band) , English indie rock band Albums [ edit ] Transition (John Coltrane album) , 1970 Transition (The First Edition album) , 1971 Transition (Buddy Rich Lionel Hampton album) , 1974 Transition (John Miles album) , 1985 Transition (Fly to
164-594: A brand of photochromic eyeglass lens and sponsor of the PGA Tour Transitions Championship Transition (roadable aircraft) , a flying car (or drivable airplane) made by Terrafugia "Shifting gears" on a railroad locomotive; see Diesel locomotive#Propulsion system operation Government and politics [ edit ] Democratic transition Transition management (governance) Social change , often synonymous with social transition Peaceful transition of power
205-490: A brand of photochromic eyeglass lens and sponsor of the PGA Tour Transitions Championship Transition (roadable aircraft) , a flying car (or drivable airplane) made by Terrafugia "Shifting gears" on a railroad locomotive; see Diesel locomotive#Propulsion system operation Government and politics [ edit ] Democratic transition Transition management (governance) Social change , often synonymous with social transition Peaceful transition of power
246-480: A chemical process that causes them to change shape and absorb a significant percentage of the visible light, i.e., they darken. These processes are reversible; once the lens is removed from strong sources of UV rays the photochromic compounds return to their transparent state. Photochromic lenses were developed by William H. Armistead and Stanley Donald Stookey at the Corning Glass Works Inc. in
287-625: A little more over the next fifteen minutes. The lenses begin to clear in the absence of UV light, and will be noticeably lighter within two minutes, mostly clear within five minutes, and fully back to their non-exposed state in about fifteen minutes. A report by the Institute of Ophthalmology at the University College London suggested that at their clearest photochromic lenses can absorb up to 20% of ambient light. Because photochromic compounds fade back to their clear state by
328-736: A move from one grappling hold or grappling position to another Transitions Championship , a men's professional golf tournament on the PGA Tour Other uses [ edit ] Transition Glacier , a glacier on the east coast of Alexander Island Care transition , wherein a patient changes health care provider See also [ edit ] All pages with titles beginning with Transition All pages with titles containing Transition Change (philosophy) , broadly synonymous The Transition (disambiguation) Transition function (disambiguation) Fade (disambiguation) Gradient (disambiguation) Topics referred to by
369-672: A move from one grappling hold or grappling position to another Transitions Championship , a men's professional golf tournament on the PGA Tour Other uses [ edit ] Transition Glacier , a glacier on the east coast of Alexander Island Care transition , wherein a patient changes health care provider See also [ edit ] All pages with titles beginning with Transition All pages with titles containing Transition Change (philosophy) , broadly synonymous The Transition (disambiguation) Transition function (disambiguation) Fade (disambiguation) Gradient (disambiguation) Topics referred to by
410-461: A narrative element or general aspects of writing style that signal changes in a story Transition (linguistics) , a certain word, expression, or other device that gives text or speech greater cohesion by making it more explicit Works [ edit ] transition (literary journal) (1927-1938) , an experimental literary journal that featured surrealist, expressionist, and Dada art and artists Transition (literary journal) (1948–1950) ,
451-461: A narrative element or general aspects of writing style that signal changes in a story Transition (linguistics) , a certain word, expression, or other device that gives text or speech greater cohesion by making it more explicit Works [ edit ] transition (literary journal) (1927-1938) , an experimental literary journal that featured surrealist, expressionist, and Dada art and artists Transition (literary journal) (1948–1950) ,
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#1732757554264492-489: A norm or practice in democratic governments, of transitions of power between different political parties United States presidential transition , the transfer of federal executive branch power from the incumbent President of the United States to the president-elect Brexit withdrawal agreement#Transition period Arts and entertainment [ edit ] Literature [ edit ] Transition (fiction) ,
533-426: A norm or practice in democratic governments, of transitions of power between different political parties United States presidential transition , the transfer of federal executive branch power from the incumbent President of the United States to the president-elect Brexit withdrawal agreement#Transition period Arts and entertainment [ edit ] Literature [ edit ] Transition (fiction) ,
574-478: A novel by Vonda N. McIntyre 1990 The Transition Weapons of Choice , the failed military experiment in John Birmingham's trilogy Axis of Time Film, radio, and television [ edit ] Film transition , a method of juxtaposing two scenes, including: Wipe (transition) , a type of film transition where one shot replaces another by travelling from one side of the frame to another or with
615-413: A novel by Vonda N. McIntyre 1990 The Transition Weapons of Choice , the failed military experiment in John Birmingham's trilogy Axis of Time Film, radio, and television [ edit ] Film transition , a method of juxtaposing two scenes, including: Wipe (transition) , a type of film transition where one shot replaces another by travelling from one side of the frame to another or with
656-564: A phase transformation between different quantum phases Quantum Hall transitions , a quantum phase transition that occurred because of the quantum Hall effect Transition radiation , contrasts to the Cherenkov radiation Atomic electron transition , the transition of an electron from one quantum state to another within an atom Beta decay transition , nuclear beta decay determined by changes in spin Laminar–turbulent transition ,
697-416: A point mutation that changes a purine nucleotide to another purine (A ↔ G) or a pyrimidine nucleotide to another pyrimidine (C ↔ T) Transitional fossil , any fossilized remains of a lifeform that exhibits the characteristics of two distinct taxonomic groups A phase during childbirth contractions during which the cervix completes its dilation Gender and sex [ edit ] Gender transition ,
738-441: A pyrimidine nucleotide to another pyrimidine (C ↔ T) Transitional fossil , any fossilized remains of a lifeform that exhibits the characteristics of two distinct taxonomic groups A phase during childbirth contractions during which the cervix completes its dilation Gender and sex [ edit ] Gender transition , the process of changing one's gender presentation to accord with one's internal sense of one's gender –
779-683: A revival of the above-mentioned literary journal Transition (novel) , a novel by Iain Banks Transitions (novel series) , a novel series by R A Salvatore Transition Magazine , a political and literary journal published from 1961 to 1976 on the African continent, and revived in 1991 in the United States Transitions Online , Czech publisher of the Transitions news journal Transition ,
820-413: A revival of the above-mentioned literary journal Transition (novel) , a novel by Iain Banks Transitions (novel series) , a novel series by R A Salvatore Transition Magazine , a political and literary journal published from 1961 to 1976 on the African continent, and revived in 1991 in the United States Transitions Online , Czech publisher of the Transitions news journal Transition ,
861-910: A special shape Dissolve (filmmaking) , a gradual transition from one image to another Transitions (film) , the world's first IMAX film in 3D Transition (1989 film) , a film by the Iranian director Kamal Tabrizi Transition (2023 film) , a documentary film Transitions (radio show) , a weekly two-hour radio show on Kiss 100 in the UK "Transitioning" ( Glee ) , an episode of US television series Glee "Transitions" ( Law & Order: Special Victims Unit episode) , an episode of US television series Law & Order: Special Victims Unit "Transition" ( The West Wing ) , an episode of US television series The West Wing "Transitions" ( The Wire ) , an episode of US television series The Wire "Transitions", an episode of US television series Without
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#1732757554264902-807: A special shape Dissolve (filmmaking) , a gradual transition from one image to another Transitions (film) , the world's first IMAX film in 3D Transition (1989 film) , a film by the Iranian director Kamal Tabrizi Transition (2023 film) , a documentary film Transitions (radio show) , a weekly two-hour radio show on Kiss 100 in the UK "Transitioning" ( Glee ) , an episode of US television series Glee "Transitions" ( Law & Order: Special Victims Unit episode) , an episode of US television series Law & Order: Special Victims Unit "Transition" ( The West Wing ) , an episode of US television series The West Wing "Transitions" ( The Wire ) , an episode of US television series The Wire "Transitions", an episode of US television series Without
943-644: A thermal process, the higher the temperature, the less dark photochromic lenses will be. This thermal effect is called "temperature dependency" and prevents these devices from achieving true sunglass darkness in very hot weather. Conversely, photochromic lenses will get very dark in cold weather conditions. Once inside, away from the triggering UV light, the cold lenses take longer to regain their transparency than warm lenses. A number of sunglass manufacturers and suppliers including INVU, BIkershades, Tifosi, Intercast, Oakley , ZEISS , Serengeti Eyewear , and Persol provide tinted lenses that use photochromism to go from
984-665: Is a particular configuration along the reaction coordinate SRM transition, the precursor and product ion pair in Selected reaction monitoring (SRM) in analytical chemistry Computing [ edit ] A movement between states of an abstract computer, described by a transition system A phase of the project lifecycle in the Rational Unified Process A paradigm describing changes of communication mechanisms, see Transition (computer science) Other uses in technology [ edit ] Transitions,
1025-533: Is a particular configuration along the reaction coordinate SRM transition, the precursor and product ion pair in Selected reaction monitoring (SRM) in analytical chemistry Computing [ edit ] A movement between states of an abstract computer, described by a transition system A phase of the project lifecycle in the Rational Unified Process A paradigm describing changes of communication mechanisms, see Transition (computer science) Other uses in technology [ edit ] Transitions,
1066-487: Is different from Wikidata All article disambiguation pages All disambiguation pages transition [REDACTED] Look up transition , transitate , transitional , transitionally , or transitions in Wiktionary, the free dictionary. Transition or transitional may refer to: Mathematics, science, and technology [ edit ] Biology [ edit ] Transition (genetics) ,
1107-502: Is different from Wikidata All article disambiguation pages All disambiguation pages Photochromic lens In one sort of technology, molecules of silver chloride or another silver halide are embedded in photochromic lenses. They are transparent to visible light without significant ultraviolet component, which is normal for artificial lighting. In another sort of technology, organic photochromic molecules, when exposed to ultraviolet (UV) rays as in direct sunlight, undergo
1148-406: The 1960s. The glass version of these lenses achieves their photochromic properties through the embedding of microcrystalline silver halides (usually silver chloride ) in a glass substrate. Plastic photochromic lenses use organic photochromic molecules (for example oxazines and naphthopyrans ) to achieve the reversible darkening effect. These lenses darken when exposed to ultraviolet light of
1189-599: The Sky album) , 2006 Transition (Ryan Leslie album) , 2009 Transition (Chipmunk album) , 2011 Transition (Steve Lukather album) , 2013 Transitions (John Digweed album) , 2006 Transitions (Aghora album) , 2006 Transitions (Westbound Train album) , 2006 Transitions (EP) , 2010 by Canadian post-hardcore band Silverstein Songs [ edit ] "Transition", by Pestilence from Obsideo , 2013 "Transition", by Theatre Of Tragedy from Forever Is
1230-502: The Sky album) , 2006 Transition (Ryan Leslie album) , 2009 Transition (Chipmunk album) , 2011 Transition (Steve Lukather album) , 2013 Transitions (John Digweed album) , 2006 Transitions (Aghora album) , 2006 Transitions (Westbound Train album) , 2006 Transitions (EP) , 2010 by Canadian post-hardcore band Silverstein Songs [ edit ] "Transition", by Pestilence from Obsideo , 2013 "Transition", by Theatre Of Tragedy from Forever Is
1271-505: The World , 2009 "The Transition", by Hawthorne Heights from The Silence in Black and White , 2004 "Transitions", by Beastie Boys from Ill Communication , 1994 "Transitions", by Zao from The Crimson Corridor , 2021 Other arts [ edit ] Transitional Style , of furniture and interior design Sport [ edit ] Transition (grappling) , in grappling is
Transition - Misplaced Pages Continue
1312-401: The World , 2009 "The Transition", by Hawthorne Heights from The Silence in Black and White , 2004 "Transitions", by Beastie Boys from Ill Communication , 1994 "Transitions", by Zao from The Crimson Corridor , 2021 Other arts [ edit ] Transitional Style , of furniture and interior design Sport [ edit ] Transition (grappling) , in grappling is
1353-573: The change between a solid and a liquid, between liquid and gas or between gas and plasma Quantum phase transition , a phase transformation between different quantum phases Quantum Hall transitions , a quantum phase transition that occurred because of the quantum Hall effect Transition radiation , contrasts to the Cherenkov radiation Atomic electron transition , the transition of an electron from one quantum state to another within an atom Beta decay transition , nuclear beta decay determined by changes in spin Laminar–turbulent transition ,
1394-443: The idea of what it means to be a man or woman Gender-affirming therapy , the physical aspect of a gender transition Gender-affirming surgery , surgical intervention a part of medical gender affirmation Physics [ edit ] Phase transition , a transformation of the state of matter; for example, the change between a solid and a liquid, between liquid and gas or between gas and plasma Quantum phase transition ,
1435-409: The intensity present in sunlight, but not in artificial light. In glass lenses, when in the presence of UV-A light (wavelengths of 320–400 nm) electrons from the glass combine with the colourless silver cations to form elemental silver. Because elemental silver is visible, the lenses appear darker. Back in the shade, this reaction is reversed. The silver returns to its original ionic state, and
1476-492: The lenses become clear. With the photochromic material dispersed in the glass substrate, the degree of darkening depends on the thickness of glass, which poses problems with variable-thickness lenses in prescription glasses. With plastic lenses, the material is typically embedded into the surface layer of the plastic in a uniform thickness of up to 150 μm. Typically, photochromic lenses darken substantially in response to UV light in less than one minute, and continue to darken
1517-412: The process of a laminar fluid flow becoming turbulent Glass transition , the reversible transition in amorphous materials Lambda transition , universality class in condensed matter physics Chemistry [ edit ] Transition metal , either an element whose atom has an incomplete d sub-shell, or any element in the d-block of the periodic table Transition state , of a chemical reaction
1558-412: The process of a laminar fluid flow becoming turbulent Glass transition , the reversible transition in amorphous materials Lambda transition , universality class in condensed matter physics Chemistry [ edit ] Transition metal , either an element whose atom has an incomplete d sub-shell, or any element in the d-block of the periodic table Transition state , of a chemical reaction
1599-426: The process of changing one's gender presentation to accord with one's internal sense of one's gender – the idea of what it means to be a man or woman Gender-affirming therapy , the physical aspect of a gender transition Gender-affirming surgery , surgical intervention a part of medical gender affirmation Physics [ edit ] Phase transition , a transformation of the state of matter; for example,
1640-417: The same term [REDACTED] This disambiguation page lists articles associated with the title Transition . 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=Transition&oldid=1258857272 " Category : Disambiguation pages Hidden categories: Short description
1681-417: The same term [REDACTED] This disambiguation page lists articles associated with the title Transition . 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=Transition&oldid=1258857272 " Category : Disambiguation pages Hidden categories: Short description