Ukuba unxiba iiglasi, kufuneka ucinge ngezinto ezingaphezulu nje kwamanani akumayeza akho. Kukwakho nento ebaluleke ngokulinganayo, kodwa mhlawumbi engaziwayo kangako, osenokuba awuzange uve ngayo. Le yindlela yokulinganisa ebizwa ngokuba yiPupillary Distance, okanye 'PD' ngamafutshane. Makhe sijonge ukuba yintoni, kutheni ibaluleke kangaka, kunye nendlela yokuyilinganisa ekhaya.
Ngamafutshane, yintoni i-Pupillary Distance (PD)?
Umgama we-Pupillary (PD) ngumgama ophakathi kwamanqaku aphakathi kwizangqa ezimbini ezimnyama (abafundi) emehlweni akho. Ulinganiswa ngeemilimitha (mm). Ngamanye amaxesha ubizwa ngokuba yi-``Interpupillary Distance - ID''.
Khawucinge nje, xa usenza iiglasi, kufuneka ulungise ilensi ukuze indawo ephezulu yamandla ibe phambi kwe-iris yakho. Ngaphandle koko, awuyi kubona ngokucacileyo. Kulapho ke umlinganiselo we-PD ubaluleke khona ukuze wenze uhlengahlengiso oluchanekileyo. Ukuba uthenga iiglasi kwi-intanethi, ngokuqinisekileyo uya kuyidinga le milinganiselo ye-PD kunye nomyalelo wakho.
Ungayilinganisa njani i-PD yakho ekhaya?
Eyona ndlela ilungileyo yokufumana olu vavanyo kukuba lwenziwe yingcali eqeqeshiweyo, njengogqirha wamehlo okanye ingcali yamehlo, kuba leyo yeyona ndlela ichanekileyo.
Nangona kunjalo, ukuba ufuna ukuzilinganisa, zikho neendlela zokwenza oko. Konke okudingayo yiteyipu yokulinganisa ephawulwe ngeemilimitha (mm) kunye nesipili. Ngamanye amaxesha ungafumana iiteyipu zokulinganisa ezikhethekileyo okanye nee-apps zefowuni ezenzelwe le njongo. Kodwa khumbula ukuba ukuchaneka kunokuba yinto engalunganga xa uzilinganisa okanye usebenzisa i-app.
Ukuba ufuna ukuzilinganisa...
Ukuba ukwenza oku wedwa, kuya kufuneka ulumke kancinci. Landela la manyathelo.
| Amanyathelo | Kwenziwe ntoni |
|---|---|
| 1. Ukulungiselela | Kwindawo ekhanyiswe kakuhle, yima phambi kwesibuko malunga ne-18 intshi ukusuka apho. |
| 2. Ukubeka indawo yokubeka iinyawo | Jika iimpawu zemilimitha kwiteyipu ukuze zibonakale esipilini, uze uzibambe phantsi kwamehlo akho nangaphezulu kwempumlo yakho. Njengokungathi ujonge phezu kodonga. |
| 3. Ukulinganisa iliso lasekunene | Vala iliso lakho lasekhohlo. Usebenzisa iliso lakho lasekunene kuphela, beka uphawu lwe-zero (0) kwirula kanye embindini wesangqa esimnyama seliso lakho lasekunene. Musa ukuyisusa irula ukusuka kweli nqanaba ukuya phambili. Ukuba iyayenza loo nto, qalisa kwakhona. |
| 4. Ukulinganisa iliso lasekhohlo | Ngoku vula iliso lakho lasekhohlo uze uvale iliso lakho lasekunene. Ukujonga kuphela ngeliso lakho lasekhohlo, bona ukuba loluphi uphawu lwemilimitha oluphakathi ngqo kwisangqa esimnyama seliso lakho lasekhohlo. |
| 5. Ukuthatha umlinganiselo | Ixabiso le-millimeter oyifumanayo liza kuba yindlela yakho yokulinganisa i-PD. |
Ukuba ulinganisa ngoncedo lomntu...
Oku kulula kunokukwenza wedwa. Umntu okuncedayo ufanele akwenze ngale ndlela.
| Amanyathelo | Oko kufanele kwenziwe ngumncedisi |
|---|---|
| 1. Ukulungiselela | Hlala phambi komntu ofuna ukumlinganisa, malunga nee-intshi ezili-18 ukusuka apho. Gcina ubuso bakho bobabini bukwinqanaba elifanayo. |
| 2. Ukubeka indawo yokubeka iinyawo | Beka unyawo phantsi kwamehlo omnye umntu nangaphezulu kwempumlo yakhe. |
| 3. Ukulinganisa iliso lasekunene | Cela umntu othatha umlinganiselo ukuba ajonge ngqo kwiliso lakho lasekhohlo (lomntu okuncedayo) . Beka u-zero (0) kwiteyiphu yokulinganisa kumphetho ongaphandle wesangqa esimnyama seliso lasekunene lomnye umntu. Musa ukuyisusa iteyiphu yokulinganisa ukusuka kweli nqanaba ukuya phambili. |
| 4. Ukulinganisa iliso lasekhohlo | Ngoku cela omnye umntu ukuba ajonge ngqo kwiliso lakho lasekunene . Ngoku jonga ukuba loluphi uphawu lwemilimitha oluhambelana nomphetho ongaphakathi wendandatho emnyama kwiliso labo lasekhohlo. |
| 5. Ukuthatha umlinganiselo | Elo xabiso le-millimeter olibonayo liyimilinganiselo yakhe ye-PD. |
Kutheni le nto olu vavanyo lwe-PD lubaluleke kangaka?
Uyazi, sibona izinto xa ukukhanya kungena elisweni. Oku kukhanya kungena elisweni ngomfundi. Emva koko oko kukhanya kudlula kwilensi kuze kugxile kwi-retina.
Kodwa ukuba ungaboni kakuhle, oku kukhanya akujolisi kakuhle. Yiyo loo nto sibona kufiphele. Umzekelo:
- Ukubona kude/i-Hyperopia
- Ukubona kufutshane/i-Myopia
- Ubunzima bokubona kufutshane njengoko ukhula (iPresbyopia)
- I-Astigmatism
Iiglasi zamehlo azifanelani ngobukhulu obufanayo. Ziyahluka ngokuxhomekeke kwizinto ezininzi, njengengxaki yakho yokubona kunye namandla eyeza lakho.
Olu vavanyo lwe-PD kufuneka luchaneke ukuze amandla elensi yeglasi agxile ngqo embindini we-iris yakho. Kulapho ke kuphela apho unokuzuza khona okuninzi kwiiglasi uze ubone ihlabathi ngokucacileyo.
Khawucinge ukuba bekuya kwenzeka ntoni ukuba umlinganiselo we-PD ubungalunganga...
Ukuba iiglasi ozisebenzisayo zenzelwe umlinganiselo ongalunganga we-PD, ngokuqinisekileyo uza kuqala ukuziva.
- Uxinzelelo lwamehlo
- Intloko ebuhlungu
- Ukuphazamiseka kokubona (ukubona izinto ngokungathi zoluliwe)
Nangona ezi mpawu zingeyongozi, azibangeli mdla. Ngaphezu koko, ukuqhubeka koxinzelelo emehlweni akho kunokwenza ukuba ukubona kwakho kube mandundu.
I-PD eqhelekileyo yomntu omdala imalunga ne-63 mm. Nangona kunjalo, inokwahluka ukusuka kwi-50 ukuya kwi-70 mm. Iyahluka kumntu nomntu. I-PD yakho inokutshintsha njengoko ukhula usengumntwana, kodwa ayitshintshi njengoko ukhula ube ngumntu omdala. Nangona kunjalo, kunqabile kakhulu, inokutshintsha kancinci emva kotyando lobuso okanye lwamehlo.
Kunini apho kungafanelekanga ukulinganisa i-PD yakho ngokwakho?
Ukuba usebenzisa iiglasi zakho ngenjongo enye (umz., ukufunda), ukufumana imilinganiselo yakho kusenokungabi yinto enkulu. Nangona kunjalo, kukho iimeko ezithile ezikhethekileyo apho udinga khona umlinganiselo wobungcali . Ukuzama ukufumana imilinganiselo yakho akuyonto ilungileyo ngelo xesha.
| Amathuba | Isizathu |
|---|---|
| Ukuba ufuna iilensi ze-multifocal | Ezi zikwaziwa ngokuba yi-"Progressive lens, bifocals, trifocals". Ezi lens zinamandla ahlukeneyo kwiindawo ezahlukeneyo. Ke ngoko, ukuba umlinganiselo we-PD awulingani ne-millimeter, umbono ungaphazamiseka ngokupheleleyo. |
| Ukuba kufuneka unxibe iiglasi ngalo lonke ixesha ukuze ubone kufutshane nakude | Xa sijonga into ethile kufutshane, i-PD yethu iyancipha malunga neemilimitha ezi-3. Lo mahluko kufuneka uqwalaselwe xa kusenziwa iiglasi ezinje. Ukulinganisa ngokuchanekileyo kubalulekile koku. |
| Ukuba kukho nakuphi na ukungalungi kwamehlo akho | Ngokwezonyango, oku kubizwa ngokuba yi-"Strabismus." Kule meko, kufuneka kuthathwe imilinganiselo eyahlukileyo kwiliso ngalinye kwaye iiglasi kufuneka zenziwe ngokuchanekileyo. |
Amanye amazwe anemithetho efuna ukuba umlinganiselo we-PD ufakwe kumyalelo wakho weglasi yamehlo. Nangona kungekho mthetho unjalo kwilizwe lethu, ungasoloko ubuza ugqirha wakho wamehlo okanye ingcali yamehlo ukuba akunike umlinganiselo we-PD. Lilungelo lakho.
Umyalezo Wokuya Ekhaya
- Umgama we-Pupillary (PD) ngumgama ophakathi kwezangqa ezimnyama zamehlo akho. Olu vavanyo lubalulekile ukuze ufumane indawo efanelekileyo kwiiglasi zakho zamehlo.
- Ukunxiba iiglasi ezenzelwe umlinganiselo ongalunganga we-PD kunokubangela ukuxinana kwamehlo, iintloko ezibuhlungu, kunye nokungaboni kakuhle.
- Nangona ungalithatha eli nyathelo ekhaya, eyona ndlela ichanekileyo nekhuselekileyo kukulithatha lihlolwe yingcali.
- Qiniseka ukuba ufumana umlinganiselo wobuchwephesha, ingakumbi ukuba usebenzisa iilensi ze-multifocal okanye unemeko efana ne-strabismus.
- Ukuba umyalelo wakho awubandakanyi umlinganiselo we-PD, ungoyiki ukubuza ugqirha wakho okanye ingcali yamehlo ngayo.
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