Ha ho na matšoenyeho - seo ha se bolele hore u tlameha ho apara li-bifocals tse sa thabiseng kapa li-trifocals.Bakeng sa batho ba bangata, lilense tse tsoelang pele tse se nang mela ke khetho e ntle haholo.
Lilense tse tsoelang pele ke eng?
Lilense tse tsoelang pele ke lilense tsa mahlo a no-line multifocal tse shebahalang hantle joaloka lilense tsa pono e le 'ngoe.Ka mantsoe a mang, lilense tse tsoelang pele li tla u thusa ho bona ka ho hlaka libakeng tsohle ntle le tse tenang (le tse hlalosang lilemo) "bifocal lines" tse bonahalang ka li-bifocals le trifocals tse tloaelehileng.
Matla a lilense tse tsoelang pele a fetoha butle-butle ho tloha ntlheng e 'ngoe ho ea ho e 'ngoe holim'a lense, e fana ka matla a nepahetseng a ho bona lintho ka ho hlaka hoo e batlang e le sebaka leha e le sefe.
Ka lehlakoreng le leng, li-Bifocals li na le matla a mabeli feela a lense - e 'ngoe ke ea ho bona lintho tse hōle ka ho hlaka le matla a bobeli karolong e ka tlaase ea lense bakeng sa ho bona ka ho hlaka sebakeng se itseng sa ho bala.Khokahano lipakeng tsa libaka tsena tsa matla tse fapaneng ka ho hlaka e hlalosoa ke "bifocal line" e bonahalang e tšelang bohareng ba lense.
Lilense tse tsoelang pele, ka linako tse ling li bitsoa "no-line bifocals" hobane ha li na mohala ona o bonahalang oa bifocal.Empa lilense tse tsoelang pele li na le moralo o tsoetseng pele haholo oa multifocal ho feta li-bifocals kapa trifocals.
Lilense tse tsoelang pele tsa Premium, hangata li fana ka matšeliso le ts'ebetso e ntle ka ho fetisisa, empa ho na le mefuta e meng e mengata le mesebetsi e meng hape, joalo ka lense e tsoelang pele ea photochromic, lense e tsoelang pele ea bluecut joalo-joalo, le lisebelisoa tse sa tšoaneng.U ka iphumanela e loketseng leqepheng la ronahttps://www.universeoptical.com/progressive-lenses-product/.
Batho ba bangata ba qala ho hloka likhalase tsa mahlo tse nang le mahlo a mangata ka nako e itseng ka mor'a lilemo tse 40. Ke nakong eo phetoho e tloaelehileng ea botsofali ka leihlong e bitsoang presbyopia e fokotsa bokhoni ba rona ba ho bona hantle haufi.Ho mang kapa mang ea nang le presbyopia, lilense tse tsoelang pele li na le melemo e mengata ea pono le litlolo ha li bapisoa le li-bifocals tsa setso le trifocals.
Moralo oa multifocal oa lilense tse tsoelang pele o fana ka melemo e ka tlase ea bohlokoa:
E fana ka pono e hlakileng libakeng tsohle (ho e-na le libaka tse peli kapa tse tharo tse fapaneng tsa ho shebella).
E felisa "setšoantšo se tlokomang" se khathatsang se bakoang ke li-bifocals le trifocals.Mona ke moo lintho li fetohang ka tšohanyetso ka ho hlaka le boemo bo bonahalang ha mahlo a hao a tsamaea meleng e bonahalang ea lilense tsena.
Hobane ha ho na "bifocal lines" tse bonahalang lilenseng tse tsoelang pele, li u fa ponahalo ea bocha ho feta li-bifocals kapa trifocals.(Lebaka lena feela e ka ba lebaka leo ka lona batho ba bangata kajeno ba roalang lilense tse tsoelang pele ho feta palo ea ba roala bifocal le trifocals li kopantsoe.)