Kuona acuity bvunzo

Iyo yekuona acuity bvunzo inoshandiswa kuona mavara madiki diki iwe aunogona kuverenga pane yakaenzana chati (Snellen chati) kana kadhi rakabatwa 20 tsoka (6 metres) kure. Machati akakosha anoshandiswa pakuyedza kumatunhu akapfupika kupfuura tsoka makumi maviri (6 metres). Mamwe machati eSnellen ari emavhidhiyo monitors anoratidza mavara kana mifananidzo.

Muedzo uyu unogona kuitirwa muhofisi yemupi wezvehutano, chikoro, nzvimbo yebasa, kana kumwe kunhu.

Iwe unozokumbirwa kubvisa magirazi ako kana malensi ekumira uye kumira kana kugara 20 tsoka (6 metres) kubva pazati reziso. Iwe unozochengeta maziso maviri akavhurika.

Iwe unozobvunzwa kuvhara ziso rimwe nechanza cheruoko rwako, chidimbu chebepa, kana padiki padiki iwe uchiverenga zvinonzwika mutsetse mudiki kwazvo wetsamba iwe waunogona kuona pachati. Nhamba, mitsara, kana mifananidzo inoshandiswa kune vanhu vasingakwanise kuverenga, kunyanya vana.

Kana iwe usina chokwadi nezve tsamba, iwe unogona kufungidzira. Bvunzo iyi inoitwa pane rimwe ziso, uye imwe panguva. Kana zvichidikanwa, zvinodzokororwa paunenge uchipfeka magirazi ako kana kutaurirana. Iwe unogona zvakare kubvunzwa kuti uverenge mavara kana nhamba kubva pakadhi rakabatwa 14 inches (36 masentimita) kubva kumeso kwako. Izvi zvichaedza chiono chako chiri padyo.

Hapana gadziriro yakasarudzika inodikanwa bvunzo iyi.

Iko hakuna kusagadzikana.

Iko kunoonekwa acuity bvunzo chikamu chenguva yekuongororwa kwemaziso kana kuwongorora kwakawanda kwemuviri, kunyanya kana paine shanduko pane zvakaratidzwa kana dambudziko nemaonero.

Muvana, bvunzo inoitwa kutarisisa matambudziko ekuona. Matambudziko ekuona muvana vadiki anogona kugadziriswa kana kuvandudzwa. Matambudziko asingaonekwe kana asina kurapwa anogona kutungamira kukuvara kwekusingaperi kwekuona.

Kune dzimwe nzira dzekutarisa maonero muvana vadiki kwazvo, kana mune vanhu vasingazive tsamba kana nhamba.

Kuona kwekuona kunoratidzwa sechikamu.

• Nhamba yepamusoro inoreva chinhambwe chaunomira kubva pachati. Izvi zvinowanzoita 20 tsoka (6 metres).
• Nhamba yepazasi inoratidza chinhambwe icho munhu ane maziso akajairika aigona kuverenga iwo iwo iwo mutsara wawakaverenga nenzira kwayo.

Semuenzaniso, 20/20 inoonekwa seyakajairika. 20/40 inoratidza kuti mutsetse wawakaverenga nemazvo pamamita makumi matanhatu kubva kure unogona kuverengerwa nemunhu ane chiono chakajairika kubva pamamita makumi mana (gumi nemaviri) kure. Kunze kweUnited States, inoonekwa acuity inoratidzirwa senhamba yekupedzisira. Semuenzaniso, 20/20 iri 1.0, 20/40 iri 0.5, 20/80 iri 0.25, 20/100 iri 0.2, zvichingodaro.

Kunyangwe ukapotsa tsamba imwechete kana mbiri pamutsetse mudiki waunogona kuverenga, iwe uchiri kutarisirwa kunge uine chiratidzo chakaenzana neiyo tambo.

Mhedzisiro isina kujairika inogona kunge iri chiratidzo chekuti unoda magirazi kana kutaurirana. Kana zvinogona kureva kuti une mamiriro eziso anoda kuongororwazve nemupi.

Iko hakuna njodzi nemuedzo uyu.

Kuedza kwemaziso - acuity; Chiratidzo bvunzo - acuity; Snellen bvunzo

• Ziso
• Kuona acuity bvunzo
• Zvakajairika, kuona pedyo, uye kuona zviri kure

Feder RS, Olsen TW, Prum BE Jr, et al. Inonzwisisika yevakuru yezvekurapa maziso ongororo Yakasarudzika Dzidzira Muenzaniso mhedzisiro. Ophthalmology. 2016; 123 (1): 209-236. PMID: 26581558 www.ncbi.nlm.nih.gov/pubmed/26581558.

Rubin GS. Kutaridzika kuona uye kusiyanisa kwekunzwa. Mu: Schachat AP, Sadda SVR, Hinton DR, Wilkinson CP, Wiedemann P, eds. Retina yaRyan. 6th ed. Philadelphia, PA: Elsevier; 2018: chits.