Yintoni i-presbyopia?
"I-Presbyopia" yinto eqhelekileyo ye-physiological kwaye inxulumene ne-lens.Ilensi yekristale iyalastiki.Ino-elasticity entle xa isencinci.Iliso lomntu liyakwazi ukubona kufuphi nakude ngokwenziwa kwelensi eyikristale.Nangona kunjalo, njengoko iminyaka ikhula, i-crystalline lens iyaqina ngokuthe ngcembe kwaye iyancipha, kwaye emva koko i-elasticity iyancipha.Ngelo xesha, amandla okunciphisa i-ciliary muscle ayancipha.Amandla agxininise kwi-eyeball aya kuncipha, kwaye indawo yokuhlala iya kuncipha, kwaye i-presbyopia iyenzeka ngeli xesha.
Ziziphi iilensi zabantu abadala?
Iilensi zePrimiyamu eziqhubela phambili (ezifana neelensi zeVarilux) zihlala zibonelela ngeyona nto ithuthuzelayo kunye nokusebenza, kodwa kukho nezinye iibrendi ezininzi.Ingcali yakho yokhathalelo lwamehlo inokuxoxa nawe ngeempawu kunye noncedo lweelensi eziqhubekayo zamva nje kwaye zikuncede ufumane ezona lens zibalaseleyo kwiimfuno zakho ezithile.
ukubona izinto ngokucacileyo nakuwuphi na umgama.
I-Bifocals, kwelinye icala, inamandla amabini kuphela e-lens-enye yokubona izinto ezikude ngokucacileyo kunye namandla esibini kwindawo esezantsi.
isiqingatha selensi yokubona ngokucacileyo kumgama ochaziweyo wokufunda.Ukudibana phakathi kwezi zowuni zamandla ezahlukeneyo ngokwahlukileyo
ichazwa "ngumgca we-bifocal" obonakalayo onqumla kumbindi welensi.
IiNzuzo zeLens eziqhubelekayo
Iilensi eziqhubela phambili, kwelinye icala, zinamandla amaninzi eelensi ngaphezu kwee-bifocals okanye ii-trifocals, kwaye kukho utshintsho oluthe chu kumandla ukusuka kwindawo ukuya kwelinye kumphezulu welensi.
Uyilo oluninzi lweelensi eziqhubekayo lubonelela ngezi nzuzo zibalulekileyo:
* Inika umbono ocacileyo kuyo yonke imigama (kunokuba imigama nje emibini okanye emithathu eyahlukileyo).
* Iphelisa "ukutsiba komfanekiso" okukhathazayo okubangelwa yi-bifocals kunye ne-trifocals.Apha kulapho izinto zitshintsha ngesiquphe ekucaceni nakwindawo ebonakalayo xa amehlo akho eshukuma kwimigca ebonakalayo kwezi lens.
* Ngenxa yokuba akukho "bifocal lines" ezibonakalayo kwiilensi eziqhubekayo, zikunika inkangeleko yobutsha ngakumbi kune-bifocals okanye i-trifocals.(Esi sizathu sisodwa sinokuba kutheni abantu abaninzi namhlanje benxiba iilensi eziqhubekayo kunenani labanxiba i-bifocal kunye ne-trifocals zidityanisiwe.)
Ixesha lokuposa: Oct-14-2022