
jackson cross cylinder

jackson cross cylinder (jesisi) anedi netra saastravettalu, keella nipunulu mariyu optometristlu vaari saadhaarana kanti pareekshalo, mukhyamgaa astigmatism unna rogulalo diddubaatu lens saktini nirnayinchadamlo upayoginche oka parikaram. idhi kanti daggara pareeksha kosam kooda upayoginchabadutundi.
parikaram.
jackson cross cylinder anedi oke takkuva shakti gala lens, idhi oka plus cylinder mariyu samaana shakti gala mainus cylinder kalayika, okadaanikokati lambamgaa akshamtho, rendu akshaala madhya 45 degreela vadda handle unchabadutundi. anduvalla jesisi anedi oka spherocylidrical lens, dheenilo cylinder yokka shakti golam yokka shakti kante rettimpu mariyu vyatiraeka sanketam ii.zii. + 0.5ds/-1.0dc ledhaa + 0.25ds/-0.5dc. jesisi +/- 1thoo sahaa vividha saktulalo andubaatulo unnaayi, saadhaaranamgaa +/- 0.25 mariyu +/- 0.50 upayoginchabadataayi. mainus mariyu plus saktula akshanni suuchimchadaaniki chukkalu ledhaa panktulu unnaayi.
suuchanalu.
jackson cross cylinder anedi astigmatism unna rogulalo diddubaatu lens saktini mariyu daani akshanni nirnayinchadaaniki upayoginchabadutundi. idhi kanti daggara pareeksha kosam kooda upayoginchabadutundi.
prakriya.
jackson cross cylindernu upayoginche mundu golaakaara lensto uttamamgaa sarididdabadina drushtini gurtinchaali. drushtivaishamya vishayamlo, retinapai gandaragolam yokka vruttam unnappudu golaakaara katakamtho uttama drushtini pondavacchu.
astigmatismnu gurtinchadam.
golaakaara lensto uttamamgaa sarididdabadina drushtini modata gurtinchaali. jesisi lens modata 180° vadda mainus-cylinder akshamtho, aapai 90° vadda akshamtho golaakaara lens meeda unchabadutundi. drushti loe thedaa lekapothe, jesisi lens aksham 45° mariyu 135° thoo pareekshanu punaraavrutam cheyandi. roogi mallii drushtilo etuvanti vyatyaasaanni nivedinchakapothe, astigmatism undadu mariyu sthomathalo merugudala unte sthuupaakaara lensnu astigmatismnu saricheyadaaniki prayatninchaali.
aksham yokka merugudala.
astigmatism diddubaatulo sthuupaakaara lens yokka aksham yokka merugudala trial framelo diddubaatu lens yokka akshaniki samaantaramgaa handletho diddubaatu lensto paatu jesisini unchadam dwara jarugutundi. cross cylinderlo mainus mariyu plus lens parasparam marela handle tippabadutundi. rendu sthaanaalalo kooda drushtilo vyatyaasam lekapothe, diddubaatu lens yokka aksham sarainadi mariyu drushtilo vyatyaasam unte, spashtamaina drushtini pondadaaniki aksham tippali. aksham merugaina vaipu 5 degreela tippali.
shakti yokka merugudala.
astigmatism diddubaatulo sthuupaakaara lens yokka saktini meruguparachadam anedi trial framelo diddubaatu lens yokka akshaniki samaantaramgaa jesisi shakti yokka akshamtho diddubaatu lensto paatu jesisini unchadam dwara jarugutundi. handle tippabadutundi, tadwara cross cylinder interchangeelalo mainus mariyu plus lens mariyu yea sthaanamloonainaa drushtilo vyatyaasam lekapothe, diddubaatu lens yokka shakti sarainadi mariyu drushtilo vyatyaasam unte, saktini sardubaatu cheyali.
vasati sthalaaniki daggaragaa.
40 centimeters vadda unna ekakaalika mariyu binacular cross cylinder kanugonnavi, nivaasaaniki daggaragaa unna sthaanam gurinchi mariyu presbiopianu saricheyadaaniki avasaramaina adanamgaa unna samacharam gurinchi teliyajestaayi.
charitra.
1837loe, aangla ganita shaastravetta mariyu khagola shaastravetta georg biddle airy sthuupaakaara katakanni kanugoni, drushtivaishamyaanni saricheyadaaniki dheenini upayoginchaaru. 1849loe, airish aangla bhouthika shaastravetta mariyu ganita shaastravetta georg stokes astigmatismnu nirdhaarinchadaaniki stokes lensnu kanugonnaru. eee lenslo rendu sthuupaakaara katakamulu, oka plano-convex mariyu oka plano-concave unnaayi, ivi vyatiraeka disalalo tippabadataayi. 1887loe edward jackson astigmatismnu gurtinchadamlo savarinchina stokes lens vadakanni vivarinchaadu, mariyu 1907loe athanu cross cylindernu upayoginchi astigmatismlo sarichese cylinder yokka aksham yokka nirdhaarananu vivarinchaadu. athanu upayoginchina handletho kuudina savarinchina cross cylinder lensnu taruvaata jackson cross cylinder anie pilicharu.