Amehlo
Amehlo kusisitho somzimba esisebusweni esenza bona umuntu akghone ukubona.[1] Ilihlo lenza bona umuntu akghone ukubona umkhanyo bese athathe lokhu akubonako akuse engcondweni bonyana ingcondo iyokuhlaziya. Amehlo kumafesidiri wommoya ngombana akghona ukuveza umizwa yomuntu, ihloso nofana imicabango yangaphakathi.Amehlo enenkophe begodu ngaphezulu kwawo kunamatjhiya.Inkophe zivikela bona kungangeni iinsila emehlweni enzingenza bona umnutu aphandlwe.
Ukkwakheka kwelihlo
[edit | hlela umthombo]Amehlo akheke ngamalarha nangezakhiwo ezinengi, esinye nesinye sinomsebenzi wawo. Ilarha lelihlo elingaphandle khulu yi khoniya. Isakhiwo sakhona sisandulungu begodu ngiyo evale ilihlo ngaphambili. Ngaphasi kwekhoniya kune-iris, ekuyimembreni enombala. Ilawula inani lomkhanyo ongena ngelihlweni. IPhuphili yimbobo encani ngaphakathi kwe- iris eyehlisa inani lomkhanyo engena ngelihlweni[2]
Ngemuva kwe- iris kune-lens, lesi sisakhiwo esibonakalako esikghon ukutjhugulula ibumbeko bese sise umkhanyo ku retina. Iretina lilarha elitjhulula umkhanyo ube siyelelisi segezi esiya engcondweni bese ingcondo ikghone ukuhlathulula lokho umuntu akubonileko.[3]Amehlo aqakathekile ngombana enza bona umuntu akghone ukubona yoke into esephasini. Ngaphandle kwamehlo umuntu angekhe akghone ukuzwa ubumnandi bokuphila ngokupheleko.
Iinkomba
[edit | hlela umthombo]- ↑ Nischler, C., Michael, R., Wintersteller, C., Marvan, P., Van Rijn, L.J., Coppens, J.E., Van Den Berg, T.J., Emesz, M. and Grabner, G., 2013. Iris color and visual functions. Graefe's Archive for Clinical and Experimental Ophthalmology, 251, pp.195-202.
- ↑ Irsch, K. and Guyton, D.L., 2009. Anatomy of Eyes. Encyclopedia of Biometrics, 1.
- ↑ Iris: Anatomy, Function, and Associated Conditions