Izinja zibona kanjani?

Inkolelo-mbono yokuthi izinja zibona yonke into njengefilimu emnyama nemhlophe yaphikiswa abacwaningi baseMelika ngo-2012. Kwavela ukuthi empeleni, izilwane zihlukanisa imibala, nakuba incane kakhulu kunabantu.

Ukubona umbala kanye ne-myopia

Ukujula kuphela ku-biology kukuvumela ukuthi uqonde kahle ukuthi inja ibona kanjani umhlaba oyizungezile. Ama-photoreceptors anesibopho sokubonwa kwemibala esakhiweni seso: lezi yizinduku nezigaxa ku-retina, ezithole amagama anjalo ngenxa yokuma kwazo. Kunezinhlobo ezintathu zezigaxa kuyi- retina yeso lomuntu, futhi zisivumela ukuba sihlukanise imibala ebomvu, eluhlaza, neluhlaza okwesibhakabhaka.

Iso lenja lihlelwe ngendlela ehlukile: isibonelo, linezinhlobo ezimbili kuphela zamakhoni ku-retina, futhi ngenxa yalesi sizathu, izilwane ezifuywayo azikwazi ukuhlukanisa phakathi kwama-hues aphuzi-oluhlaza kanye ne-red-orange.

Isithombe somhlaba esibonwa yizinja sifana nendlela abantu abayizimpumputhe ababona ngayo umhlaba.

Isibonelo, isilwane esifuywayo asinakwenzeka ukubona ibhola noma ithoyizi elibomvu otshanini. Kodwa lapha umuzwa wokuhogela uyasiza: inja ingakwazi ukuhogela ngokuhogela.

Nokho, lokhu akuwona kuphela umehluko phakathi kombono womuntu nenja. Njengoba kwenzeka, lezi zilwane zibona isithombe somhlaba ngokucacile kancane kunabantu. Isizathu sibuye silele ekwakhekeni kwezitho zokubona. Indawo ephuzi inesibopho sokucaca nokukhanya kwesithombe esibonwa ngumuntu. Inja ayinayo le ndawo, ngakho izilwane ezifuywayo aziyihlukanisi kahle imininingwane. Uma umuntu obona kahle ekwazi ukufunda umugqa weshumi wetafula lombono, kusho ukuthi inja ingakwazi ukubona owesithathu kuphela. Kodwa ezilwaneni, ukubona kahle akubalulekile njengokukwazi ukubona umuntu ongase abe isisulu ngesikhathi.

Inkambu yokubuka nokuzingela ebusuku

Inja iyisilwane esizingelayo, yingakho idinga ikhono lokubona ebumnyameni. Futhi, ngempela, ebusuku, lezi zilwane zibona kangcono kakhulu kunabantu futhi zibona izithunzi eziningi ezimpunga. Lokhu kubangelwa izici ezingavamile zesakhiwo sezitho ezibukwayo zenja: ama-photoreceptors afanayo - izinduku - anesibopho sokuzwela kwamehlo ebumnyameni, futhi maningi kakhulu ku-retina enja kunabantu. Ngakho-ke, ngisho nakusihlwa, isilwane sakho sizizwa sikhululekile.

Kuyathakazelisa ukuthi abameleli bezinhlobo ezahlukene babona umhlaba ngendlela ehlukile. Isizathu sisendimeni yokubuka. Izinja ezizingelayo, njengama-beagles, anamehlo aqhelelene kakhulu, zinensimu ebanzi yombono, kuyilapho izinja ezinamehlo aseduze, njengama-pugs noma ama-Pekingese, zinensimu encane yombono.

Indlela yokuhlola ukubona kwenja?

Akuyona imfihlo ukuthi umbono wenja ungawohloka ngokukhula. Nokho, ziningi ezinye izici ezibangela ukuthuthukiswa kwezifo zamehlo. Umnikazi oqaphile angase abone izimpawu zokuqala zokukhubazeka kokubona enjeni:

• Amehlo afiphele noma abomvu;
• Ukubonakala kwezimfihlo;
• Ukuluma, okuvame ukubangela inja ukuba inwaye amehlo ngezidladla zayo.

Uphawu olubalulekile lokuwohloka kombono wenja ukuqondiswa emkhathini. Uma isilwane sikhubeka ezintweni, singaziboni izithiyo, noma sibukeka sengathi kuzo, ukubonisana nodokotela wezilwane kuyadingeka.

18 September 2017

Kuvuselelwe: Disemba 21, 2017