Ukuhlolwa kwe-acuity ebonakalayo

Ukuhlolwa kwe-acuity visual kusetshenziselwa ukuthola izinhlamvu ezincane kunazo zonke ongazifunda eshadini elilinganiselwe (ishadi leSnellen) noma ikhadi eligcinwe kude ngamamitha ayi-6. Amashadi akhethekile asetshenziswa lapho kuhlolwa emabangeni amafushane kunamamitha ayisithupha (6 metres). Amanye amashadi we-Snellen empeleni angabaqaphi bevidiyo abonisa izinhlamvu noma izithombe.

Lokhu kuhlolwa kungenziwa ehhovisi lomhlinzeki wezempilo, esikoleni, emsebenzini, noma kwenye indawo.

Uzocelwa ukuthi ususe izingilazi zakho noma amalensi oxhumana nawo bese ume noma uhlale amamitha ayi-6 ukusuka eshadini leso. Uzogcina amehlo womabili evulekile.

Uzocelwa ukuthi umboze iso elilodwa ngentende yesandla sakho, ucezu lwephepha, noma isigwedlo esincane ngenkathi ufunda ngokuzwakalayo umugqa omncane kakhulu wezinhlamvu ongazibona eshadini. Izinombolo, imigqa, noma izithombe zisetshenziselwa abantu abangakwazi ukufunda, ikakhulukazi izingane.

Uma ungenaso isiqiniseko sencwadi, ungaqagela. Lokhu kuhlolwa kwenziwa esweni ngalinye, futhi ngakunye. Uma kudingeka, iyaphindwa ngenkathi ugqoka izingilazi zakho noma oxhumana nabo. Ungase futhi ucelwe ukuthi ufunde izinhlamvu noma izinombolo kusuka ekhadini eligcinwe ngamasentimitha angu-14 (amasentimitha angama-36) ebusweni bakho. Lokhu kuzohlola umbono wakho oseduze.

Akukho ukulungiselela okukhethekile okudingekile kulolu vivinyo.

Akukho ukungakhululeki.

Ukuhlolwa kwe-acuity visual kuyingxenye ejwayelekile yokuhlolwa kwamehlo noma ukuhlolwa komzimba okujwayelekile, ikakhulukazi uma kukhona ushintsho kumbono noma inkinga ngombono.

Ezinganeni, isivivinyo senziwa ukuze kuhlolwe izinkinga zombono. Izinkinga zombono ezinganeni ezincane zivame ukulungiswa noma zenziwe ngcono. Izinkinga ezingatholakali noma ezingalashwa zingaholela ekulimaleni okungapheli kombono.

Kunezinye izindlela zokuhlola umbono ezinganeni ezisencane kakhulu, noma kubantu abangazazi izinhlamvu noma izinombolo zabo.

Ubukhali obubonakalayo buboniswa njengengxenyana.

• Inombolo ephezulu isho ibanga olimi kusuka eshadini. Lokhu kuvamise ukuba ngamamitha ayi-6.
• Inombolo engezansi ikhombisa ibanga lapho umuntu onamehlo ajwayelekile angafunda khona umugqa ofanayo owufunde kahle.

Isibonelo, i-20/20 ibhekwa njengokujwayelekile. U-20/40 ukhombisa ukuthi umugqa owufunde kahle ezinyaweni ezingama-20 (amamitha ayi-6) ungafundwa ngumuntu onombono ojwayelekile ukusuka kumamitha angama-40 (amamitha ayi-12). Ngaphandle kwe-United States, amandla okubuka avezwa njengenombolo yedesimali. Isibonelo, i-20/20 ingu-1.0, 20/40 ingu-0.5, 20/80 ingu-0.25, 20/100 ingu-0.2, njalonjalo.

Noma uphuthelwa uhlamvu olulodwa noma ezimbili kulayini omncane kunazo zonke ongazifunda, usabhekwa njengombono olingana nalowo mugqa.

Imiphumela engajwayelekile ingaba uphawu lokuthi udinga izingilazi noma oxhumana nabo. Noma kungasho ukuthi unesimo samehlo esidinga ukuhlolwa okwengeziwe ngumhlinzeki.

Azikho izingozi ngalokhu kuhlolwa.

Ukuhlolwa kwamehlo - amandla; Ukuhlolwa kombono - amandla; Ukuhlolwa kukaSnellen

• Iso
• Ukuhlolwa kwe-acuity ebonakalayo
• Okujwayelekile, ukubona eduze, nokubona kude

UFeder RS, u-Olsen TW, uPrum BE Jr, et al. Ukuhlolwa okuphelele kwamehlo kwezokwelapha kwabantu abadala Okuncanyelwayo Kwezinkombandlela Zokuzikhethela. I-Ophthalmology. 2016; 123 (1): 209-236. I-PMID: 26581558 www.ncbi.nlm.nih.gov/pubmed/26581558.

I-Rubin GS. Ukuzwela okubonakalayo nokuzwela kokuqhathanisa. Ku: Schachat AP, Sadda SVR, Hinton DR, Wilkinson CP, Wiedemann P, abahleli. URitina kaRyan. Umhlaka 6. IPhiladelphia, PA: Elsevier; 2018: isahluko 13.