Ubuninzi bokubonwa ngumlinganiselo wendlela onokuyibona ngayo. Enye yezona zinto zibaluleke kakhulu ekuhlolweni kwamehlo, uvavanyo lwezinto ezibonakalayo luya kukunceda ugqirha weziliso lakho lichonge ukuba ngaba awufuni ukulungiswa kwombono .
Ukuvavanywa kwezinto ezibonakalayo ezingabonakaliyo kungabikho endaweni yokuhlola isohlo . Nangona kunjalo, ngenye yezona zinto zibaluleke kakhulu xa kunokuhlaziya inkqubo yomntu.
Ubuninzi bokubukeka buya kuvavanywa kude kunye nokusondela.
Ubungqina bobuboniso obude
Ubuqhetseba obubonakalayo obuqhelekileyo bubungakanani bezinga lakho lokulahleka kombono. Kulinganiswa ngokuvavanya into encinci enokuyibona, ngokuqhelekileyo kwitshati efumaneka kwiinyawo ezingama-20. Lo mlinganiselo ubhalwa njengengxube, kunye ne- 20/20 ebonwa ngumbono oqhelekileyo. Ubuqhetseba obubonakalayo obuqhelekileyo buvame ukuvavanywa ngokubeka iso ngalinye kweso kwaye emva kokulinganisa amehlo abo kunye. Kwiimeko ezininzi, itshati yamehlo isetyenziswe ngobukhulu obufana neeleta eziqhubeka zincinci kwaye zincinci.
Kufuphi noVuality Acuity
Okukufuphi kwezinto ezibonakalayo zibonakalisa indlela okwazi ngayo ukubona izinto ezikufutshane. Ngokuqhelekileyo lilinganiselwa kuma-intshi angama-16, yindlela efanelekileyo yokulinganisa amandla akho okuhlangabezana nemisebenzi efana nokufunda okanye yokuthunga. Kwiimeko ezininzi, ubuninzi obubonakalayo bubunzima buboniswa ngamehlo avulekileyo. Uya kucelwa ukuba ubambe ikhadi elikufutshane kwi-intshi ezili-16 kwaye ufunde umgca omncinci kunokwenzeka.
Ubungqina boBuchule obuPhakathi
Ubuninzi obubonakalayo obubonakalayo bubungakanani bendlela obubona ngayo ubude bomda wengqondo okanye kwindawo ethile phakathi komgama kunye kunye. Nangona kungengomlinganiselo oqhelekileyo ekuhlolweni kwamehlo, kuba kubaluleke ngakumbi ukuba oogqirha bamajoni bavavanye ubunzima obubonakalayo phakathi kweso sibalo kuba kukho iikhomputha ezininzi ezisetyenzisiweyo.
Yintoni enokuba nayo 20/20 Umbono?
Kukho iindlela ezininzi zokujonga ubungqina obubonakalayo. Enye imilinganiselo yezinto ezibonakalayo eziqhelekileyo ezisetyenziswayo yi-Snellen acuity acuity, ebizwa ngokuba ngu-ophthalmologist waseDutch, uHerman Snellen kwaye yaveliswa ngo-1862. I-Snellen i-acuity ebonakalayo ibalwa njengeqhezu kwaye imelwe njengomgama apho uvavanyo luqhutyelwa khona kumgama apho i-optotype encinci ibonisiwe ibonisa i-angle ye-5 yemizuzu ye-arc kwaye iinkcukacha zeso sotype zenza i-minute ye-arc. I-optotype yileta echanekileyo, imo, umfanekiso okanye inombolo esetyenzisiweyo ukubonisa umxholo obonakalayo ngobuninzi obubonakalayo. Ukusebenzisa inkqubo yeetrikri, ifom umgama wokubukela kumamitha ngaphezu kobukhulu beleta kwiiyunithi ze-M. Ngoko, 6/6 iyafana ne-20/20.
20/20 ubuqhetseba obubonakalayo kuthetha ukuba umntu unokubona iinkcukacha ezincinci ukusuka kwii-20 ezinyaweni ezifanayo kunye nomntu onesiqhelo esifanelekileyo uza kubona kwii-20 ezinyaweni. Ukuba umntu unobuncwane obubonakalayo obuyi-20/40, kuthiwa ubone iinkcukacha ezivela kwiinyawo ezingama-20 ezifanayo kunye nomntu onesiqhelo esifanelekileyo uza kuzibona ukusuka kwiimitha ezingama-40. I-Normal okanye i-average personality acuity kuthiwa yi-20/20. Nangona kunjalo, baninzi abantu abanokubona i-20/15 kunye nabambalwa abanokufumana ukubonakala kwe-20/10.
Kunokwenzeka ukuba nombono ophezulu ngaphezu kwe-20/20: ubuninzi obuphezulu bamehlo abantu ngaphandle kwezixhobo ezibonakalayo (njengama-binoculars) ngokuqhelekileyo becinga ukuba malunga ne-20/10.
Umthombo:
I-American Optometric Association (AOA). Ubungqina bobuboniso: Yintoni i-20/20 Umbono? AOA, 2006-10.