Iintsana zibona kude, yaye njengoko zikhula namehlo azo ayakhula de abone “amehlo agqibeleleyo,” abizwa ngokuba yi<em>emmetropia.
Akukacaciswa ngokupheleleyo ukuba yintoni na ebonisa iliso ukuba lixesha lokuyeka ukukhula, kodwa siyazi ukuba kubantwana abaninzi iliso liyaqhubeka likhula kwi-emmetropia kwaye baye babone kufutshane.
Ngokusisiseko, xa iliso likhula ixesha elide kakhulu ukukhanya okungaphakathi kwiliso kufika kwindawo ekugxilwe kuyo phambi kweretina kunakwiretina, nto leyo ebangela ukuba lingaboni kakuhle, ngoko ke kufuneka sinxibe iindondo zokutshintsha ii-optics size sigxininise ukukhanya kwiretina kwakhona.
Xa sikhula, sibandezeleka ngendlela eyahlukileyo. Izihlunu zethu ziba lukhuni kwaye ilensi ayilungelelanisi ngokulula ukuze siqale ukuphulukana nombono okufutshane.
Abantu abaninzi abadala kufuneka banxibe ii-bifocals ezineelensi ezimbini ezahlukeneyo-enye yokulungisa iingxaki zokubona kufutshane kwaye enye ilungise iingxaki zokubona kude.
Kule mihla, ngaphezu kwesiqingatha sabantwana kunye nabakwishumi elivisayo eTshayina ababoni kufutshane, ngokohlolisiso olwenziwa ngamaziko aphakamileyo karhulumente, athi makwenziwe iinzame zokuthintela nokulawula le meko. Ukuba uhamba ezitratweni zaseTshayina namhlanje, uya kuqaphela ngokukhawuleza ukuba uninzi lwabantu abaselula lunxiba iindondo.
Ngaba yingxaki yamaTshayina kuphela?
Ngokuqinisekileyo akunjalo. Ukuxhaphaka okukhulayo kwe-myopia akuyongxaki yaseTshayina kuphela, kodwa yeyona ngxaki yaseMpuma Asia. Ngokophononongo olupapashwe kwijenali yezonyango i-Lancet ngo-2012, uMzantsi Korea ukhokela ipakethi, kunye ne-96% yabantu abadala abancinci abane-myopia; kwaye izinga leSeoul liphezulu nangakumbi. ESingapore, eli nani lingama-82%.
Uyintoni unobangela wale ngxaki yehlabathi lonke?
Ziliqela izinto ezinxulunyaniswa nezinga eliphezulu lokujonga kufutshane; kwaye ezona ngxaki zintathu ziphezulu zifunyaniswa ukunqongophala kokusebenza ngokomzimba kwangaphandle, ukungabikho kokulala ngokwaneleyo ngenxa yomsebenzi onzima wangaphandle kunye nokusetyenziswa ngokugqithisileyo kweemveliso zombane.
