Uvavanyo lwe-Visual Acuity

Yintoni uVavanyo lwe-Visual Acuity?

Uvavanyo lwe-Visual Acuity luvavanyo olulula kodwa oluyimfuneko olusetyenziselwa ukulinganisa ukubukhali okanye ukucaca kombono womntu. Inceda iingcali zokhathalelo lwamehlo ukuba ziqonde indlela onokuthi uzibone ngayo izinto kwimigama eyahlukeneyo. Olu vavanyo lelinye lamanyathelo okuqala kuvavanyo lwamehlo kwaye lubalulekile ekuxilongeni iingxaki zombono ezifana nokubona kufutshane, ukubona kude, okanye ezinye iimpazamo zokujonga.

Itshathi ye-Snellen

Itshathi ye-Snellen sesona sixhobo sisetyenziswa kakhulu sovavanyo lwe-visual acuity. Inemigca eli-11 yoonobumba, ukuqala kowona mkhulu phezulu kwaye uya usiba mncinci ngokuqhubekayo. Iileta zikhethwa ukumela ubukhulu obuhlukeneyo abantu abaninzi abanombono oqhelekileyo kufuneka bakwazi ukuzibona kumgama othile.

Iziphumo zovavanyo zichazwe ngokwecandelo elifana ne-20/20, 20/40, okanye 20/200. Eli candelo libonisa ukungaboni kakuhle kwakho xa kuthelekiswa noko umntu onombono oqhelekileyo anokubona kumgama ofanayo.

• 20/20 umbono: Oku kuthetha ukuba unokubona kwiinyawo ze-20 ukuba umntu onombono oqhelekileyo unokubona kwii-20 ezinyaweni. Kuthathwa njengombono "oqhelekileyo".
• 20/40 umbono: Oku kuthetha ukuba unokubona kwiinyawo ze-20 ukuba umntu onombono oqhelekileyo unokubona kwiinyawo ze-40.
• 20/200 umbono: Oku kuchazwa njengobumfama obusemthethweni eUnited States. Kuthetha ukuba unokubona kwiinyawo ze-20 ukuba umntu onombono oqhelekileyo unokubona kwii-200 ezinyaweni.

Lusebenza njani uvavanyo lwe-Visual Acuity

Ngexesha loVavanyo lwe-Visual Acuity, le nkqubo ilandelayo ilandelwa ngokuqhelekileyo:

• Ukubekwa: Uya kucelwa ukuba uhlale kumgama othile ukusuka kwitshathi ye-Snellen (ngokuqhelekileyo i-20 iinyawo).
• NONE Uyalelwe ukuba ugqume iliso elinye ngesiziba okanye ngesandla sakho.
• Ukufunda iTshati: Uya kucelwa ukuba ufunde owona mgca umncinci woonobumba onokuwubona, ukuqala ukusuka phezulu kwitshathi kwaye usebenze indlela yakho ezantsi.
• Tshintsha Amehlo: Emva kokufunda itshati ngeliso elinye, inkqubo iphinda iphindwe ngelinye iliso.
• iziphumo: Umgca omncinane onokuwufunda ngeso ngalinye usetyenziselwa ukumisela ukukwazi kwakho ukubona.

Ukusetyenziswa koVavanyo lwe-Visual Acuity

Uvavanyo lwe-Visual Acuity Test lunosetyenziso oluninzi kwinkalo ye-optometry kunye ne-ophthalmology, kwaye ludlala indima ebalulekileyo ekubhaqweni nasekulawuleni iingxaki ezahlukeneyo zombono. Nalu usetyenziso oluphambili:

1. Ukuxilongwa kweengxaki zombono

Uvavanyo lusetyenziswa ikakhulu ukuchonga iimpazamo zokuphinda zibonakale njenge:

• Ukujonga ngokusondeleyo (Myopia): Imeko apho unokubona izinto ezikufutshane ngokucacileyo kodwa ube nobunzima bokubona izinto ezikude.
• Ukubona Phambi (Hyperopia): Imeko apho unokubona izinto ezikude ngokucacileyo kodwa uyasokola ukubona izinto ezikufutshane.
• I-Astigmatism: Imeko ebangelwa yicornea emile ngendlela engaqhelekanga okanye ilens ekhokelela ekuboneni luzizi kuyo yonke imigama.
• I-Presbyopia: Ubunzima obunxulumene nobudala bokubona izinto ezisondeleyo ngenxa yokuncipha kwesakhono sokugxila kwiliso.

2. Ukubeka iliso kwiMpilo yamehlo

Uvavanyo oluqhelekileyo lwe-acuity acuity lunceda ukubeka iliso kwimpilo yamehlo ekuhambeni kwexesha, ukufumanisa naluphi na utshintsho kwimbono. Oku kubaluleke ngakumbi kubantu abaneemeko ezinjenge-glaucoma, i-cataracts, okanye i-macular degeneration, apho umbono unokuwohloka ngokuthe ngcembe.

3. UVavanyo lweMfuno yeeLensi zokuLungisa

Uvavanyo lunceda oogqirha bamehlo babone ukuba ufuna iiglasi okanye iilensi zoqhagamshelwano. Ilinganisa indlela amehlo akho agxile ngayo kwizinto ezikude kwaye inceda ukumisela iilensi ezichanekileyo zokuphucula umbono wakho.

4. Ukumisela ukuthotywa koMbono kwiiNjongo zoMthetho

Kumazwe amaninzi, iziphumo zobuchule bokubona zisetyenziselwa ukubona ukuba umntu ufanelekile na ukuba abe yimfama ngokusemthethweni. Ngokomzekelo, eUnited States, umbono ongama-20/200 ugqalwa njengomqobo wobumfama obusemthethweni.

5. Iimviwo zangaphambi kokuQeshwa okanye zeLayisensi

Imisebenzi ethile kunye nemisebenzi, enjengokuqhuba, ukuqhuba, okanye ukusebenza kwimisebenzi ethile, ifuna ukuba abantu ngabanye baphumelele uvavanyo lokubona kakuhle ukuze baqinisekise ukuba bayahlangabezana nomgangatho ofunekayo wokhuseleko nokusebenza.

Uluhlu oluqhelekileyo lwe-Visual Acuity

I-Visual acuity ilinganiswa kusetyenziswa iqhezu (umz., 20/20 okanye 20/40). Nantsi into ethethwa yiqhezu ngalinye:

• 20/20 umbono: Oku kuthathwa njengombono "oqhelekileyo". Umntu onombono we-20/20 unokubona ngokucacileyo into kwiinyawo ezingama-20, okuqhelekileyo okulindelweyo kumntu onamehlo aphilileyo.
• 20/40 umbono: Ukuba unombono we-20/40, unokubona kwiinyawo ezingama-20 ukuba umntu onombono oqhelekileyo unokubona ukusuka kwii-40 ezinyaweni. Oku kuthathwa njengokukhubazeka kokubona okuphakathi.
• 20/200 umbono: Lo ngumqobo wobumfama obusemthethweni kumazwe amaninzi. Umntu onombono we-20/200 unokubona kwiinyawo ezingama-20 ukuba umntu onombono oqhelekileyo unokubona kwiinyawo ezingama-200.

Ezinye iziphumo ezinokuthi zibekho:

• 20/15 umbono: Oku kungcono kunombono oqhelekileyo, oku kuthetha ukuba unokubona izinto kwiinyawo ze-20 eziya kufuna abanye ukuba babe kwi-15 iinyawo ukuze babone.
• 20/40 Umbono okanye okubi ngakumbi: Oku kunokubonisa imfuneko yeelensi zokulungisa okanye uviwo olungaphaya ukuze kufunyanwe imiba yempilo yamehlo enokwenzeka.

Ululungiselela njani uvavanyo lwe-Visual Acuity

UVavanyo lwe-Visual Acuity lulula, lukhawuleza, kwaye aluna-invasive. Nangona kunjalo, kukho amanyathelo ambalwa onokuthi uwathathe ukulungiselela uvavanyo ukuqinisekisa iziphumo ezichanekileyo:

1. Qinisekisa ukuba uphumle kakuhle: Ukuba uziva udiniwe, oko kunokuchaphazela ukukwazi kwakho ukugxila kakuhle ngexesha lovavanyo. Qinisekisa ukuba uphumle kakuhle phambi koviwo lwakho ukuze ufumane ezona ziphumo zibalaseleyo.
2. Kuphephe Ukunxiba Abafowunelwa Phambi Kovavanyo: Ukuba unxibe iilensi zoqhagamshelwano, kuyacetyiswa ukuba uzisuse phambi kovavanyo, ngakumbi ukuba ulindelwe ngumyalelo omtsha kagqirha. Iilensi zoqhagamshelwano ngamanye amaxesha zinokuchaphazela ukuchaneka kovavanyo ukuba azifakwanga kakuhle.
3. Kuphephe ukuthotywa kwamehlo okanye amanye amayeza: Amanye amayeza wamehlo, ngakumbi lawo asetyenziselwa ukunyanga iimeko ezifana namehlo omileyo, anokuchaphazela umbono wakho. Qinisekisa ukuba uxoxe ngawo nawaphi na amayeza owasebenzisayo nogqirha wakho phambi kovavanyo.
4. Yiza noLudwe lwaMayeza: Ukuba ngoku uphantsi konyango lwazo naziphi na iimeko zamehlo okanye ezinye iinkxalabo zempilo ezinokuchaphazela umbono wakho, kuyanceda ukuzisa uluhlu lwamayeza akho kwidinga.
5. Kulungele ukuxoxa ngeempawu: Ukuba ufumana naluphi na utshintsho kumbono, njengobunzima bokubona ekukhanyeni okuphantsi, umbono ocacileyo, okanye ubunzima bokufunda, qiniseka ukuba ukhankanya ezi mpawu kumboneleli wakho wamehlo.

Utoliko lweziphumo zovavanyo

Iziphumo zakho zovavanyo lwe-acuity acuity ziya kuchazwa njengeqhezu, kunye ne-numerator (inombolo ephezulu) ebonisa umgama apho unokubona khona oonobumba, kunye nedinomineyitha (inombolo esezantsi) ebonisa umgama apho umntu onombono oqhelekileyo anokufunda khona. iileta ezifanayo.

Iziphumo zoMzekelo:

• 20/20 umbono: Akukho mpazamo ye-refractive, unokubona ngokucacileyo kwii-20 ezinyaweni.
• 20/40 umbono: Impazamo yerefraction ephakathi, inokufuna iilensi zokulungisa.
• 20/200 umbono: Ubumfama obusemthethweni, bunokufuna ungenelelo lonyango okanye izixhobo zokubona.

Ukuba iziphumo zakho zibonisa imfuneko yeeglasi okanye iilensi zoqhagamshelwano, ingcali yakho yokhathalelo lwamehlo iya kukunceda ukuba wenze isigqibo esifanelekileyo.

Ii-FAQ ezili-10 malunga noVavanyo lwe-Visual Acuity

1. Yintoni injongo yoVavanyo lwe-Visual Acuity?

   Uvavanyo lwe-Visual Acuity Test lulinganisa ukucaca kombono wakho kwimigama eyahlukeneyo. Inceda ekuboneni iimpazamo eziphinda-phindeneyo ezifana nokujonga kufutshane, ukubona kude, kunye ne-astigmatism, kunye nokubeka iliso kwimpilo yamehlo iyonke.

2. Luqhutywa njani uvavanyo lwe-Visual Acuity?

   Ngexesha lovavanyo, uya kucelwa ukuba uvale iliso elinye kwaye ufunde iileta ezivela kwitshathi ebekwe kumgama othile. Le nkqubo iphinda iphindwe ngelinye iliso, kwaye iziphumo zirekhodwa njengeqhezu elibonisa ukucaca kwakho okubonakalayo.

3. Sithetha ntoni isiphumo sika-20/20?

   Umbono we-20/20 uthathwa njengombono oqhelekileyo. Kuthetha ukuba unokubona kwiinyawo ze-20 ukuba umntu onombono oqhelekileyo unokubona njani kwiinyawo ze-20.

4. Ngaba uvavanyo lwe-Visual Acuity luyakwazi ukubona izifo zamehlo?

   Ngelixa uVavanyo lwe-Visual Acuity lugqwesileyo ekubhaqeni iimpazamo eziphinda-phindeneyo, aluchazi ngokuthe ngqo izifo ezifana neglaucoma okanye i-cataract. Nangona kunjalo, yinxalenye ebalulekileyo yovavanyo lwamehlo kwaye ingabonisa imfuneko yovavanyo olongezelelweyo.

5. Ngaba uvavanyo lwe-Visual Acuity lubuhlungu?

   Hayi, uvavanyo alunantlungu ngokupheleleyo. Kubandakanya ukufunda oonobumba betshati, iliso elinye ngexesha.

6. Ngaba kufuneka ndilungiselele uVavanyo lwe-Visual Acuity?

   Kufuneka uqinisekise ukuba uphumle kakuhle kwaye uphephe ukunxiba iilensi zoqhagamshelwano phambi kovavanyo. Xoxa ngazo naziphi na iimpawu zombono kunye nomboneleli wakho wamehlo.

7. Kwenzeka ntoni xa ndingaluphumelelanga uVavanyo lwe-Visual Acuity?

   Ukungaphumeleli kuvavanyo akuthethi ukuba kukho into engalunganga kakhulu, kodwa kubonisa ingxaki yombono enokuthi ifune iilensi zokulungisa okanye uvavanyo olongezelelweyo.

8. Zithetha ntoni iziphumo zoVavanyo lwe-Visual Acuity?

   Iziphumo zinikwa njengeqhezu. Umzekelo, i-20/40 ithetha ukuba unokubona iinyawo ezingama-20 oko abanye banokukubona kwiinyawo ezingama-40. Okukhona lisezantsi inani lesibini, kokukhona umbono wakho ube mandundu.

9. Ngaba isiphumo se-20/40 siqhelekileyo?

   Umbono we-20/40 ungaphantsi kwesiqhelo kodwa usasebenza kwimisebenzi emininzi. Unokumiselwa iiglasi okanye iilensi zoqhagamshelwano ukuze kucace ngcono.

10. Ngaba uVavanyo lwe-Visual Acuity luyakwazi ukuxilonga iimeko ezifana ne-cataract?

    Uvavanyo alukwazi ukuxilonga ngokuthe ngqo i-cataract, kodwa ukuba ungaboni kakuhle, lunokubonisa imeko efana ne-cataract, ikhuthaza ukuvavanya ngakumbi ngumboneleli wakho wamehlo.

isiphelo

Uvavanyo lwe-Visual Acuity luyinxalenye ebalulekileyo yovavanyo lwempilo yamehlo, inika ulwazi oluxabisekileyo malunga nokucaca kombono wakho kunye nobukho beempazamo eziphikisayo. Nokuba uphantsi kovavanyo lwesiqhelo lwamehlo okanye ufumana ubunzima bokubonwayo, olu vavanyo lulula nolungaphazamisiyo lunceda ukufumanisa ukuba iilensi zokulungisa okanye uviwo olongezelelweyo luyimfuneko. Uvavanyo lwarhoqo lubalulekile ekugcineni impilo yamehlo eyona iphezulu, ngakumbi njengoko sikhula okanye sineemeko ezinokuchaphazela ukubona. Soloko ubonisana nengcali yokhathalelo lwamehlo ukuba ubona naluphi na utshintsho kumbono wakho okanye ukuba unenkxalabo malunga nempilo yamehlo akho.