Uvavanyo olujongene nolu vavanyo lwenkundla luyindlela ekhawulezayo kwaye elula yokulinganisa ummandla wakho wombono. Uvavanyo lovavanyo lwenzululwazi luvavanyo lokuqala oluqhutywe ngugqirha wakho wezilwanyana okanye ochwepheshe njengesixhobo esisisiseko sokuhlola. Ukuvavanywa kwintsimi yokubambisana kuyimfuneko encinci okanye akukho nto eneemfuno ezizodwa kwaye inokwenziwa malunga nantoni na imeko. Olu vavanyo lokuxilonga lukwaziwa nangokuthi "ukubalwa komunwe" ngokuba umhloli angasebenzisa iminwe yakhe ngexesha lovavanyo.
Iminwe ingabonwa okanye ibalwe, kuxhomekeke kumlinganiselo wovavanyo. Okokuqala, bobabini amehlo baya kuvavanywa (binocular) kwaye nganye iso liya kuvavanywa ngokuhlukileyo. Isiphako embonweni siya kufunyanwa ukuba isigulane sihluleka ukubona iminwe ngokuchanekileyo.
Ingaba isebenza kanjani
Ukuze uqale uvavanyo, uya kucelwa ukuba ugubungele iliso elinye, ulungele amehlo akho kwamehlo omhloli. Umhloli uya kuqhuba ukunyakaza kwamanwe, ukuzisa izandla zakhe kwintsimi yakho ebonakalayo evela kumacala. Ngenxa yokuba umbono wakho uhlukaniswe zibe ezine ezine-quadrants kwingqondo yakho, umhloli uya kubamba iminwe kwi-quadrant nganye. Uza kuthiwa eminwe emininzi oyibonayo ngaphandle kokuyijonga, ngoko uvavanya umzila wakho, okanye uhlangothi, umbono.
Ukusebenzisa iziphumo zolu vavanyo, ugqirha uya kuba nako ukunquma ukuba unenkxalabo ekuboneni kwiinkalo ezithile zentsimi yakho, kunye nezizathu ezinokwenzeka. Uvavanyo olujongene nokuhlolwa kwintsimi ebonakalayo luncedo ekufumaneni iindawo eziyimfama kunye nezifo zamehlo , kunye nezinye iingxaki zempilo.
Iingxaki zentsimi ezibonakalayo zinemibangela yezizathu ezingahlali zivela kwiso. Ugqirha wakho angasebenzisa ulwazi kwiimvavanyo zengingqi ebonakalayo ukuze ahlolisise iingxaki okanye iimeko ezilandelayo:
- glaucoma
- ukuhlaselwa kwamanzi
- optic glioma
- ubuhlungu beengqondo
- isifo sokugubhuka
- ukubetha
- i-arteritis yesikhashana
- iziphazamiso zesistim seentloko
- iingxaki zokugulisa intloko
- igazi elonyukayo
Uvavanyo lweeNkcukacha zoHlaziyo lweeKomishini
Oomatshini benkundla yezinto ezibonakalayo zekhompyutha banikezela iingxelo ezipheleleyo kunye ezichanekileyo kunendlela yokuhlola ngomunwe. Ngexesha lokuvavanya, iindawo ezincinci zokukhanya zivela kwisikrini kwaye isiguli kufuneka sijonge phambili kwaye nqakraza iqhosha xa bebona ukukhanya kwesibane. Ukukhanya kukhanya kuyahluka ngokukhanya. Umatshini uza kugqiba umlinganiselo omncinane wokukhanya okufunekayo ukuba isigulane sibone ukukhanya kwinqanaba ngalinye.
Ukuvavanywa kweeNkcazo zoMboniso njengeThuluzi lokuThengisa
Uvavanyo olubonakalayo lwimihlaba luyasetyenziswa ngokubanzi ukuxilonga okanye ukubeka i-glaucoma. (I-Glaucoma iyisifo esibonakaliswe ngenyameko yamehlo ephezulu.) Ezininzi iintlobo ze-glaucoma ziqala ngokulahlekelwa kombono wendlela. Akukho naluphi unyango lwe-glaucoma, ukuyeka ukuqhubeka kwesifo kuya kunceda ukugcina umbono. Ukuqhubela phambili kwesifo kufuneka kuhlolwe ngokusondeleyo ngokubukela intsimi ebonakalayo kunye noxinzelelo lwe-intraocular.
Umthombo:
I-Choplin, uNeil T kunye noRussel P. Edwards. Humphrey Field Analyzer. SLACK Incorporated, ngo-1995.