Botenya ba lense ka likhalase bo susumetsoa ke lintlha tse ngata, tseo har'a tsona matla a lense e leng eona ntho e ka sehloohong.Botenya ba Lense ba Myopia e Phahameng bo tenya ho feta ba Myopia e tlase.Leha ho le joalo, ha ho tluoa tabeng ea botenya ka kakaretso, bophara ba Lense le bona bo bohlokoa, 'me ho khetha foreimi e nyenyane ho ka fokotsa haholo botenya ba Lense.Sebōpeho sa Lense le sona se bohlokoa, joalo ka Myopia e karolong e teteaneng ea peripheral ea Lense ea concave, Hyperopia e bohareng ba karolo e teteaneng ea Convex Lens le peripheral e tšesaane.
Index ea refractive (June 20) ea lense ke tšobotsi ea bohlokoa le ntlha e lumellang mokuli ho laola botenya ba Lense.Refractive index ke karo-karolelano ea sekhahla seo khanya e fetang ka har'a mokhoa o itseng (joalo ka khalase, metsi, polasetiki, moea) ho ea ho sekhahla sa lona sebakeng se se nang letho.Ha index ea refractive e phahame, e theola sekhahla sa phetiso ea leseli bohareng, 'me ho totobetse haholoanyane ho refraction ea leseli.Ka hona, lense e nang le index e phahameng ea refractive e refract khanya ka katleho 'me ka hona e tšesaane ho feta lense e nang le index e tlase ea refractive.
Likhalase li ’nile tsa etsoa ka likhalase ka makholo a lilemo, ’me bakuli ba bang ba ntse ba tsitlallela lilense tsa khalase hobane ba ikutloa hore li fana ka pono e ntle ka ho fetisisa.Lilense tsa sejoale-joale tsa khalase li entsoe ka Crown Glass, thepa e nang le phallo e tlase ea chromatic le e hananang le ho hoa.Crown Glass e na le index e phahameng ea refractive, esita le ho feta ea lilense tse ngata tsa polasetiki.Leha ho le joalo, ka lebaka la boima ba eona bo phahameng, khalase ea moqhaka e boima ho feta lilense tsa polasetiki tse nang le index e tšoanang ea refractive, le hoja lilense tsa polasetiki hangata li le boima.Bakuli ba atisa ho khetha lilense tse bobebe, ke ka lebaka leo ba khethang lilense tsa polasetiki ho feta khalase ea moqhaka.
Plastiki e Tloaelehileng bakeng sa likhalase tsa foreimi ke Columbia Resin-39(CR-39) .Ena ke thepa e ntle ea lense, e hananang le leha e le mengoapo, 'me e boima ba halofo feela ea boima ba lense e tšoanang ea khalase.Leha ho le joalo, index ea eona e tlase ea refractive e bolela hore Lense e batla e le tenya ha e etsoa likhalase tse phahameng tsa diopter.
Ho entsoe lisebelisoa tse fapaneng tsa lense tsa polasetiki, tse hlahisang index e phahameng ea refractive empa lilense tse tšesaane, tse bobebe.Tse kang polycarbonate (1.586) , polyurethane (1.595) esita le khalase ea thepa e khethehileng (1.70) .Lilense tsena ha li tenya ho feta tsa bakuli ba bang ba myopic, ha li ntse li fana ka palo e phahameng ea likhato tsa bophahamo.Leha ho le joalo, tse ling tsa lisebelisoa tsena li na le likhaello tse kholo ho feta lisebelisoa tse tlase tsa index ea refractive mme ha li mamellehe habonolo.Bongata ba lisebelisoa tsena li bonolo, li hanana le ho robeha ho feta khalase kapa polasetiki ea CR-39, empa li tloaetse ho phunya.
Nako ea poso: Jul-28-2021