Amakati yizilwane zasebusuku; okungukuthi, bahlala bekhuthele lapho ilanga lishona. Ukuze ukwazi ukuhamba ngokuphepha, umzimba wakhe uguquke ukuze uvumelane kahle kakhulu nendawo ahlala kuyo, futhi enye yezinto azuzile ukukwazi ukubona ebumnyameni inqobo nje uma kunokukhanya okuthile (okufana ekhipha inyanga ngokwesibonelo, noma isigxobo sesibani).
Kodwa ngokwenza lokhu abaningi bethu bazibuze kaningi Kungani amakati enamehlo akhanya ebumnyameni?. Uma ufuna futhi ukuthi imfihlakalo ixazululwe, qhubeka ufunda!
Asebenza kanjani amehlo ekati?
Okokuqala, kubalulekile ukwazi ukuthi asebenza kanjani amehlo abangane bethu abathandekayo abanoboya. Yebo, lapho ukukhanya kugadla entweni ethile, kukhanya kuyi-cornea, eyisivikelo esisobala esivikela inhlamvu yeso, bese iyigxilisa. Lokhu kukhanya kuhlunga ku-iris, okuyingxenye enemibala yeso, kudlule umfundi. Lapho, kumfundi, izokwandiswa ebumnyameni ukuze ikwazi ukuthwebula ukukhanya okuningi, noma izoncishiswa ukungena kancane. Imisipha ye-iris yilabo abayisayina noma bayivula.
Ukukhanya okungenayo kudlula ilensi, okuzokuphinda kuyibeke kabusha. Kamuva, izoqhubeka nokungena kwayo esweni, ishayisane ne-retina emangqamuzana ayo ezinzwa (zibizwa ngokuthi izigaxa nezinduku) thumela amasiginali ebuchosheni ngomthambo we-optic. Lapho nje ifinyelela ebuchosheni, izorekhoda isithombe.
Kungani amehlo akho ekhanya ebumnyameni?
Ungase ucabange ukuthi amehlo amakati asebenza ngokufana ncamashi nawabantu, kodwa bekungeke kube okulungile ngokuphelele: onoboya bane-tapetum lucidum, okuyisendlalelo esikhethekile samaselula esisengxenyeni engemuva yamehlo. EMpumalanga kukhombisa ukukhanya kubuyele emuva kumaseli e-retina, kube sengathi yisibuko.
Ngalesi sizathu, noma ngabe kunokukhanya okuncane kakhulu endaweni, bangabona izinto esingeke sikwazi ukuhlukanisa kuzo. Futhi, lokhu futhi kuyisizathu esenza amehlo akho akhanye kusihlwa.
Ngabe ukuthole kuthakazelisa? Uma kunjalo, unganqikazi ukwabelana ngakho kumanethiwekhi wakho omphakathi 🙂.