Kungani ingane ishintsha umbala wamehlo futhi nini?

Kusukela ngosuku lokuqala emva kokuvela kwengane, abazali abasha bazama ukuqonda ukuthi ingane ifana nobani. Futhi uma ukuma kwamashiya noma isithozane kungakhona ngandlela-thile kungaphendula imibuzo enjalo, khona-ke umbala wamehlo awunakwenzeka. Lapho bebeletha, abaningi banenhlanzi eluhlaza okwesibhakabhaka , kodwa uma umbala weso lomntwana ushintsha, bangase bahlale beluhlaza futhi bebahlaza.

Ukubonakala kwengane kuguquka kanjani?

Ukuvela kwengane kungashintsha ngokujulile ezinyangeni ezimbalwa emva kokuzalwa. Uhlaka lomzimba, ukuma kwempumu nombala wamehlo kushintshe ngokuphawulekayo. Izingane ezizalwa ezinsukwini ezimbalwa ezedlule zivame ukuba nesisu esivelele, isifuba esithukuthele kanye nomzimba ohlangene. Ngezinye izikhathi izingane zinezinyosi ezincane, ezithatha isimo esijwayelekile ngokuphelele. Ekugcineni, i- iris ivame ukukhanya okwesibhakabhaka, kodwa ngokuhamba kwesikhathi, umbala wamehlo ushintsha ezinganeni.

Kungani umbala wamehlo ushintsha

Iso lomntwana lihlelwe ngendlela efanayo nangomuntu omdala. Ihlanganisa izinzwa ze-optic, i-cornea ne-lens. Ubuningi obubonakalayo obusana luyancishiswa futhi bunwetshwa nsuku zonke, silwela ukujwayelekile komthetho. Kakade ngosuku lwesishiyagalombili emva kokubeletha umntwana angagxila amehlo akhe ezintweni ezithile emasekhondi ambalwa. Ngemva kwezinyanga ezimbalwa, iso liqala ukuhlala isikhathi eside, futhi ezinyangeni eziyisithupha ingane isivele ibona isimo sezinto. Ngonyaka umntwana angakwazi ukubona ngisho nezithombe. Umbala we-iris wengane unqunywa yi-pigment melanin. Inani elikhulu linikeza umuntu onamehlo aluhlaza, futhi uma i-melanin encane, amehlo azoba grey. I-Melanin ayithinti ikhono lokubona futhi livela ngemva kweminyaka embalwa, lapho umbala wengane wengane ishintsha unomphela. Ukubikezela kusengaphambili ukuthi kunjani umbala emehlweni, kodwa abantu abanamehlo aluhlaza kunamahloni okukhanya, ngakho-ke uma umama noma ubaba enamehlo amnyama, izingane zingase zibe nsundu futhi. Inqubo yokukhiqiza i-pigment yomuntu ngamunye ihlukile, ngakho-ke ngezinye izikhathi kuvela ukuthi uma ingane ishintsha umbala wamehlo okokuqala, ingase ingabi yindlela yokugcina, futhi ezinyangeni ezimbalwa kuyoba nezinguquko ezintsha. Into esemqoka okufanele ilandelwe ngumbala womfundi. Uma abafundi bezingane bengacabangi futhi bekhululekile, lokhu kungaba yisizathu sokuvakashela oculist. Ukuvimbela isifo seso ngesikhathi kubaluleke kakhulu, ngakho umbala womfundi udinga ukunakekelwa. Kodwa umbala wamehlo awubalulekile kakhulu uma umntwana ejabule futhi enempilo.

Ezinye izibalo

Ngokuvamile, lapho ingane ingashintsha umbala weso, iphenduka amehlo anesibhakabhaka - lena ngumbala ovame kakhulu emhlabeni. Umthunzi we-rarest uhlaza, ngaphandle kwezingane eziyikhulu, amehlo amabili kuphela azoba namahlo anjalo, futhi kwamanye amazwe abantu abanemibala enjalo ye-iris abatholakali nhlobo. Ngaphezu kwalokho, i-toddock eyodwa yekhulu ibuye ibe namabala emibala ehlukahlukene. Lesi simo sibizwa ngokuthi i-heterochromia, futhi akuyona isici esibukwayo . I-Genetics ikholelwa ukuthi abazali abanemibala ehlukahlukene bayoba nengane iris iris izoba yinto ethile emkhatsini wemithunzi yamehlo nobaba, ngaphandle kokuthi, eqinisweni, omunye wabo unamehlo aluhlaza.