Iintsana ziyakwazi ukubona kude, kwaye njengoko zikhula amehlo azo akhula de afikelele kwinqanaba "lokubona okugqibeleleyo", elibizwa ngokuba yi-emmetropia.
Akukacaci ngokupheleleyo ukuba yintoni ebonisa iliso ukuba lixesha lokuba liyeke ukukhula, kodwa siyazi ukuba kubantwana abaninzi iliso liyaqhubeka likhula lidlule kwi-emmetropia baze babone izinto ezikufutshane.
Ngokwenyani, xa iliso likhula ixesha elide kakhulu ukukhanya ngaphakathi kweliso kuya kujolisa phambi kwe-retina kunokuba kujolise kwi-retina, nto leyo ebangela umbono ofipheleyo, ngoko ke kufuneka sinxibe iiglasi ukuze sitshintshe i-optics size sijolise ukukhanya kwi-retina kwakhona.
Xa sikhula, sithwaxwa yinkqubo eyahlukileyo. Izicubu zethu ziyaqina kwaye ilensi ayilungiseki lula ngoko ke siqala ukulahlekelwa kukubona kufutshane.
Abantu abadala abaninzi kufuneka banxibe ii-bifocals ezineelensi ezimbini ezahlukeneyo - enye yokulungisa iingxaki zokubona kufutshane kunye nenye yokulungisa iingxaki zokubona kude.
Kule mihla, ngaphezu kwesiqingatha sabantwana kunye nolutsha eTshayina ababoni kakuhle, ngokutsho kophando olwenziwe ziiarhente zikarhulumente eziphezulu, olufuna ukuba kuqiniswe imizamo yokuthintela nokulawula le meko. Ukuba uhamba ezitalatweni zaseTshayina namhlanje, uya kukhawuleza uqaphele ukuba uninzi lwabantu abaselula banxiba iiglasi.
Ingaba yingxaki yamaTshayina kuphela?
Ngokuqinisekileyo akunjalo. Ukwanda kokuxhaphaka kwe-myopia akuyongxaki yaseTshayina kuphela, kodwa yingxaki exhaphake kakhulu eMpuma Asia. Ngokutsho kophando olupapashwe kwi-The Lancet medical journal ngo-2012, uMzantsi Korea uhamba phambili, nge-96% yabantu abadala abaselula abane-myopia; kwaye izinga laseSeoul liphezulu nangakumbi. ESingapore, eli nani liyi-82%.
Yintoni unobangela wale ngxaki ixhaphakileyo?
Zininzi izinto ezinxulunyaniswa nezinga eliphezulu lokungaboni kakuhle; kwaye iingxaki ezintathu eziphambili zifumaneka kukungabikho komsebenzi womzimba wangaphandle, ukungakwazi ukulala ngokwaneleyo ngenxa yomsebenzi onzima wangaphandle kunye nokusetyenziswa kakhulu kweemveliso ze-elektroniki.
