Umgodi okanye uvulo ophakathi kwinqanaba le-iris kweso. Umfundi ulawula ukukhanya okungena kwilihlo. Ubukhulu bomfundi bulawulwa yi dilator kunye nemisipha ye-iris.
Isizathu sokuba Sinabantwana
Umfundi ulawula ukukhanya okwenziwe kwiso. Kufana kakhulu nokupakishwa kwekhamera okuvumela ukukhanya okungakumbi kwiindawo ezibonakalayo.
Ebusuku, abafundi bethu bahlaziya ukuvumela ukukhanya ngakumbi ukuze kwandiswe umbono wethu. Kukhanya kwelanga, umfundi wethu wehla ukuya kumncinci omncinci ukuze asivumele ukusebenza ngokuqhelekileyo. Ngaphandle koko, siza kuba lula kakhulu. Oku kukhusela i-photoreceptors ebucayi kwi-retina yethu.
Kwakhona, xa sibheke into esondele kakhulu kumgama wokufunda incwadi, amehlo ethu ajika kwaye abafundi bethu behla. Xa abafundi bethu behla, kufana nokujonga i-pinhole. Ukujonga ngaphaya komngxuma omncinci kunciphisa ukugqithisa kwendawo yendawo kunye nokwandisa ubunzulu bokugxila. Oku kuphucula ubuninzi obubonakalayo . Ubungakanani bomfundi oqhelekileyo buphakathi kwe-2.5 ukuya kwi-4.0 mm.
Yiyiphi inkqubo yokulawula umfundi?
Iris , inxalenye yombala yelihlo lethu, yenziwe nge-pigment kwaye iqulethe iisethi ezimbini zezihlunu ezibusayo ezilawula ubukhulu bomfundi. i-sphincter muscle kunye ne-dilator muscle. Isihlunu se-sphincter sisesimweni somngcipheko kwimida yomfundi.
Xa zivumelwano, zithintela okanye zinciphise ubukhulu bomfundi. Iimpawu ze-dilator zisesigxina kwi-iris kwaye xa zivumelwano, zandisa okanye zandisa ubukhulu bomfundi.
Zombini iinkqubo, iiproasympathetic and sympathetic systems zilawula umfundi. Isistim sethu se-parasympathetic silawula imisebenzi yansuku zonke njengokuphumla, ukunciphisa izinga lentliziyo kunye nezinto ezifana nokugaya.
Ilawula ubungakanani bomfundi kwimisebenzi eqhelekileyo ngemini kwaye isenza utshintshe ubungakanani bomfundi ngokuxhomekeke ekukhanyeni okukhulu. Inkqubo yovelwano yinkqubo yokukhusela kwaye isinika "iimpendulo" okanye "ukulwa". Kulo mfundi, ukuba sinoyiko okanye sinoyiko, abafundi bethu baxhuma kakhulu. Oku kucatshulwa ukuvumela ukukhanya ukuze iimpendulo zethu zikhawuleze.
Ubalulekileyo kwiMpilo
Ukuhlolwa komfundi kubaluleke kakhulu kumachiza ngenxa yokuba indlela ye-neurological of the student is made of three nerves and follows the pathway long in the body. Le ndlela emithathu ye-neuron iqala kwinxalenye yengqondo ebizwa ngokuba yi-hypothalamus ize ihambe phantsi komgca wesipelini. I-neuron yesibini iphuma umthambo womgudu uhamba phezu kompopho uze ufike entanyeni apho ihlangana ne-neuron yesithathu.
Ukusuka apha kuya ngaphantsi komgca we-subclavia uze uqhube uhambo oluhamba ngaphaya komtya we-carotid uphinde uphakamise ubuchopho kunye neliso. Ngenxa yendlela ende ende, oogqirha basebenzise umfundi ukuba ahlolisise iingxaki ezinokuthi zichaphazele le ndlela. Umzekelo, umhlaza womphunga ochaphazela phezulu kwimpompho apho umlenze womfundi uhamba phezu kwawo unokuchaphazela umsebenzi wepupillary.
Ngokuxhomekeke ekulahlekeni komsebenzi umfundi ubonisa, ngamanye amaxesha bayakwazi ukuxelela indawo yokujonga umhlaza.