Inxalenye yembali: njani ukukhanya kwelanga
Kwaye amaYiputa amandulo ayesazi ukuba ilanga ngokuthe ngqo lonakalisa impilo yamehlo. Basebenzisa ipapyrus edayi ekhethekileyo ukukhusela ubuso kunye namehlo kwelanga elitshisayo laseYiputa. Kwaye ethuneni likaFaro Tutankhamun kwanomboniso weengilazi zanamhlanje zifunyenwe-idizayini eyenziwe ngamacwecwe ebhedu edibanisa iimbumba ezimbini ze-emerald. Kodwa ke iipresenti zangaphambili zeziglasi zamanje zivela kwiChina yamandulo. Iilensi zazo zaziglasi, ezenziwe nge-quartz. Ezi ngilazi zikhuseleke kakuhle kwilanga elikhanyayo, eliphazamisayo.
Iiglasi zazihlala ziphucukisiwe, kodwa kwakungekho mveliso enkulu. Zenziwe ngama-haberdasheries kunye nezibuko, kwaye zathengiswa kwiitrakethi eziqhelekileyo zemarike. Kwizibuko ze-XVI zaqala ukwenza izigugu. Babesetyenziselwa ukuvelisa amacwecwe angamapolisi amatye anqabileyo, kwaye atyhidiwe. Ngoxa uncedo lwale ngqungquthela, iilensi zeglasi zaziba lula. Kodwa loo ngongoma yayingakhokhwa kuphela kwiklasi ecebileyo.
Kwaye kuphela kwi-XX leminyaka, izibuko zelanga zazisinda kwi-revolution yangempela. Nangona ekuqaleni kweengqungquthela zeenkulungwane zokukhusela amehlo ukusuka emisebeni yelanga kwakungumtya onqabileyo wempahla, ilungelo labantu batyebi. Ngenxa yokwenza kwabo, i-tortoiseshell, uphondo, izitye ezinqabileyo kunye namatye asetyenziswa. Kwiminyaka ye-1920, kwakukho nje ukugqithiswa kwesi sithintelo, apho uCoco Chanel wayenalo isandla. Kodwa nangona kunjalo, izibuko zelanga zaziba iimpahla zabathengi kuphela kwiminyaka engamashumi amahlanu ekhulwini lokugqibela.
Indlela yokukhetha ilanga lokukhanya
Ukukhethwa kwamaphuzu akuxhomekanga kuphela kwindlela oyilwe ngayo. Zininzi izinto kufuneka ziqwalaselwe: zombini ubukhulu obufanelekileyo, kunye nomlo ohambelana neempawu ze-anatomical, kunye nombala wamehlo! Ngoko, umzekelo, ukhanyisa amehlo akho, ukukhathazeka ngakumbi kwi-ultraviolet. Kwaye konke ngenxa yokuba ixabiso elincinci yee-particle ze-pigment kwi-cornea livumela ukukhanya okungakumbi kwamehlo. Ngako oko, kuyinqweneleka ekukhanyeni ukukhetha iilazi ngezinga eliphezulu lokukhusela. Ungakhetha njani?
Kakade, musa ukuthembela kuphela kwilebula "Ukhuseleko lwe-UV". Ubuninzi beemodeli ezithengiswa kwisitrato, ivenkile kunye nakwiziko lokuthenga ngemali encinci ayinayo i-UV ehlutha iifayile. Iiglasi ezinjalo ngokuqinisekileyo azifezekanga nje indima yazo, kodwa zize zenze umonakalo wamehlo. Oku kungenxa yokuba iziglasi ezimnyama zinciphisa umlinganiselo wokukhanya ofika emehlweni, kodwa awukhuseli kumisebe ye-ultraviolet! Umfundi "ucinga" ukuba yonke into ihlelwe, iyakwandisa kwaye ivumela imitha engaphezulu ye-ultraviolet ukungena ngaphakathi. Xa ukhetha izibuko, kubalulekile ukuba uqaphele ukuba iiglasi zineengubo ezintle zokuchasana. Ngoko, ngokubonakalisa ukukhanya okubi, iilanga zelanga ziphuma kwi-lens ezimnyama zibe ngumfundi ophuculweyo, kwaye zingabangela ukutshiswa kwe-retinal. Ngenxa yoko iiglasi kunye neengubo ezichasayo zokungabonakali zifaka isandla kwi-eye strain, zingakhokelela ekubeni ziba neentloko kwaye zingakhathazeki.
Kwakhona, umbala wama-lens unendima enkulu kwimigangatho yokukhanya kwelanga. Ngokuqinisekileyo, okukhethwa kukho okulungileyo kukuba umbala oluhlaza obomvu wamalensi. Iilensi zombala oluhlaza ziphantse ukuba zingadluli i-ultraviolet kunye ne-infrared rays.
I-lens ezimhlophe zivumela ukuba ubone imibala ngokwemvelo. Kodwa izibane ezibomvu, i-orange kunye ne-yellow light filters zinyusa uxinzelelo lwe-intraocular, kubangele iindawo ezinqabileyo zendlela ephuma kuyo i-eye fluid.
Kukho neelasch photochromic nesilivere. Kwakhona kuthiwa "i-chameleon", ngenxa yokuba besafihla ngokukhawuleza, njengoko ukukhanya kokukhanya kubanda. Ukumnyama okwenziwe ngokugqithiseleyo kunika ukukhusela okukhuselekileyo emehlweni.
Emva kokugqiba kwimibala, qwa lasela iilensi. Ziyiglasi kunye neeplastiki. Naliphi i-glass lens igcina imisebe ye-ultraviolet, ngaloo ndlela ikhusela amehlo. Kodwa iilazi kunye neelayi zeglasi zingaphephile. Bakwazi ukuphulaphula nokumaza amehlo akho. Iilensi zamaplastiki zihlala zihlala zide ngaphezu kweglasi. Zenziwe nge-acrylic okanye i-polycarbonate plastiki. Nangona iipensile zeplastiki ziphukile, iinqununu ezivela kuzo zikhuselekileyo kunamaqhekeza eglasi. I-downside ye-lensi yeplastiki kukuba i-index ye-plastiki ingaphantsi kweleyo yeglasi. Kwaye iiplastiki ayigcinanga kangangoko kuneglasi kwaye ikhutshwe ngokukhawuleza. Ukuba ushiyile ukhetho lwakho kwiilensi zeplastiki, ngoko nceda uqaphele ukuba kuphela iilensi zamaplastiki eziphezulu ezingabonakali ziyakwazi ukukhusela kwimisebe ye-ultraviolet.
Xa ukhetha izibuko zelanga, kufuneka uqaphele nesakhelo. Qinisekisa ukuba uvavanya ukuhamba kweengcambu zeempumlo. Ukuba bazinzima, ke kukho uxinzelelo oluqinileyo kwibhulorho yempumlo, engakhokelela ekukhatheni okukhawulezayo. Iitempile akufanele zenze uxinzelelo kwi-whisky, okanye kwindawo engemva kwendlebe. Ubungakanani bawo bufanele ukuhambelana ngokuthe ngqo kumgama ukusuka kumgca ukuya kumgca emva kwendlebe.