Sonke sizibuze ngesinye isikhathi ukuthi izinja zibona kanjani. Phambilini bekungumbuzo onzima ukuwuphendula, kepha eminyakeni yamuva Kwenziwe izifundo zesayensi eziye zasivumela ukuthi sithole umbono wokuthi umbono walezi zilwane unjani ngempela.
Amehlo angesinye sezitho eziyigugu kakhulu nakwezethu ezinoboya. Ngenxa yokubona, kanye nezinye izinzwa, babone umhlaba obazungezile. Kungakho kubaluleke kakhulu kunoma yimuphi umnikazi ukuthi azi ukuthi izinja zibona kanjani, ngoba zibona ngombono ohluke kakhulu kowethu. Ukuqonda lokhu kuzosisiza ukuthi siqonde kangcono ontanga yethu.
Kuyadingeka ukukugcizelela lokho izinja azinakho ukunotha kobubanzi bombala obufanayo nombono womuntu, ngoba azinawo ama-receptors amaningi ombala, abizwa nangokuthi 'ama-cones'. Yize lokhu kungasho ukuthi babona umhlaba ngendlela ebi kakhulu, ngamunye umbono wabo uvumelane nezidingo zabo nokusinda kwabo.
Kulesi sihloko uzothola zonke izimpendulo zalesi sihloko esinelukuluku lokho kuzokuthakazelisa ngenxa yobunzima obukhulu besinye sezitho ezithakazelisa kakhulu iningi lezidalwa eziphilayo elinalo, ukubona.
Izinja ziyibona kanjani imibala?
Eminyakeni edlule kwakukholakala ukuthi izinja zibona kokumnyama nokumhlophe, noma kunjalo, izinja zikhonjisiwe ukuthi zibona imibala nazoEzinye, njengombala oluhlaza okwesibhakabhaka noma ophuzi, ngendlela efanayo kakhulu neyethu. Kodwa-ke, eminye imibala ibabona ngokuhlukile: okuluhlaza, isibonelo, kubonwa njengokuphuzi okumpunga, nokubomvu, njengokuphuzi okunsundu. Lokhu kusho ukuthi umbono wakho uyefana nowomuntu ongaboni kahle. Esithombeni esilandelayo ungabona uyini umehluko phakathi kombono weso lomuntu nenso lenja:
Uma ubheka kahle, uzobona ukuthi okuluhlaza okwesibhakabhaka nokuphuzi kukubona kahle, kepha leyo mibala efana nohlaza okotshani nokubomvu ayihlangene nakancane nethoni esiyibonayo.
Lokhu, noma kunjalo, akunamthelela omubi empilweni yakho yansuku zonke! Noma kunjalo izinja azikwazi ukubona ngokucaca okufana nokwethu, zibona ukunyakaza kangcono kakhulungisho nasezimweni eziphansi zokukhanya.
Izinja zingahlukanisa kalula phakathi kokuluhlaza okwesibhakabhaka nokuphuzi; Noma kunjalo, azikwazi ukubona okubomvu, okusawolintshi, noma okuluhlaza okotshani. Ngalesi sizathu, noma nini lapho siyobathengela ithoyizi elisha, kuzotuswa kakhulu ukuthi kube ngemibala abakwazi ukuyihlukanisa.
Amehlo ezinja, njengezilwane eziningi ezincelisayo, unezinhlobo ezimbili zama-photoreceptor ku-retina:
- Izinduku, okuyizinto ebezisetshenziswa ukukwazi ukubona kusihlwa nalabo abaphethe ukukhiqiza umbono we-scotopic (visual visual that happens with low low light of light).
- Izigaxa, okuyibo abathola amasiginali amaningi ezimweni eziqhakazile futhi ababhekele umbono wezithombe (ukubona okubonakalayo okwenzeka emini, lapho kukhona ukukhanya). Ukuba khona kwezinduku ezinjeni kuphakeme kakhulu kunalokho kwama-cones, okuchaza ukuthi kungani bengeke bahlukanise imibala ngendlela efanayo nathi. Kepha akudingekile kakhulu.
Leli khono libenza babe abazingeli abahle kakhulu. Uma kukhulunywa ngokujaha inyamazane yabo, uma incane, mhlawumbe ngeke bayihlukanise ebangeni elide, kepha uma ihamba, kuzoba lula kakhulu ukuyilandela. Ukuziphendukela kwemvelo, izinja zidinga ukubona kangcono ebusuku kunasemini, ngoba kulapho zisengozini enkulu yokuhlaselwa yizilwane ezidla ezinye futhi lapho zisebenza kakhulu. Kepha imiphi imibala abakwaziyo ukuyibona? Lokhu:
Izinja bane-engeli enhle kakhulu yokubuka, ngakolunye uhlangothi, banomfundi omkhulu kakhulu, ovumela ukungena okukhulu kokukhanya, yingakho amangqamuzana abo esebenza kahle kakhulu ebumnyameni.
Futhi, emehlweni abo kukhona ulwelwesi olubizwa i-tapetum lucidum esebenza njengesibuko phambi kwemisebe yokukhanya, kamuva ethunyelwa kulawo maseli e-receptor. Lokhu kuzenza zihambe njengenhlanzi esemanzini lapho kuhwalala.
Wake wazibuza ukuthi kungani amehlo ezinja ekhanya kakhulu lapho sithatha izithombe zawo ebumnyameni? Isizathu ukuthi ulwelwesi, iTapetum lucidum. Abangenelwe!
Izinja ziyibuka kanjani ithelevishini?
Mhlawumbe wake wazibona izinja zakho zihleli phambi kosofa zibuka ithelevishini. Ungalenzi iphutha, abayilandeli noma iyiphi indaba, impela balalele kuphela ngoba eminye imisindo iyabanaka.
Abantu, ngenxa yekhono lethu lokubuka nelokuqonda, bangakha indaba kusuka ezithombeni ezilandelanayo, ngoba lokhu sidinga kuphela inombolo ethile yezithombe ukudlula emehlweni ethu, ukuze sikwazi ukuzibona zilandelana ngokuqhubekayo.
Ubuwazi ukuthi ubuchopho bakho buyakwazi ukucubungula phakathi kwezithombe ezingama-70 nezingama-80 ngomzuzwana kanti okwethu kungu-60 kuphela? Lokhu kuyasiza, njengoba bengabahlaseli, bangabamba ukuhamba kwesisulu esingaba khona ngokushesha okukhulu kunabantu
Iqiniso lokuthi izinja zikubona ukunyakaza kahle zinomthelela lapho zibuka ithelevishini, ikakhulukazi ngamadivayisi amadala. Badinga inani eliphakeme lezithombe ngomzuzwana ukukubona njengokulandelanaNgakho-ke, kaningi, kumathelevishini asendulo, babona abamhlophe noma amaphasi ezithombe phakathi kozimele, hhayi izithombe ezicijile.
Ngamathelevishini wencazelo ephakeme entsha, isilinganiso sezithombe ngomzuzwana siphezulu, ngakho-ke siyaqonda ukuthi bazazisa kangcono izithombe ezilandelanisiwe kangcono. Empeleni, ucwaningo lukhombisile ukuthi bayakwazi ukuxhumana nethelevishini, ikakhulukazi uma izinja zibonakala zihhewula noma zibhonga, kodwa akwaziwa ukuthi bayakujabulela ngempela yini.
Izinja zethu ezinoboya azihlangani nezikrini njengoba senza, empeleni, iziphetho zokuqala zibonakala zikhombisa ukuthi lapho inja ibuka ithelevishini, engakwazi ukunquma phakathi komunye wabo, mane ubheke, ngaphandle kwezizathu ezikushukumisela ukuba wenze kanjalo.