Kutarisa kuonekwa kune chiyero chekuti iwe unokwanisa sei kuona. Chimwe chezvinhu zvinonyanya kukosha chekuongorora kweziso, kuonekwa kwechioni chekuona kuchabatsira dhi reziso rako kuona kana iwe usingadi kururamiswa maonero .
Kutarisa maitiro ekuedza kuongorora hakusi kubatsiridza kuongororwa kweziso rakazara . Zvisinei, iyi ndeimwe yezvinhu zvakakosha zviyero zvinogona kuitwa kana uchitarisa maonero evanhu.
Kuonekwa kwakanaka kunogona kuongororwa ari kure uye pamwe nekuswedera pedyo.
Kureva Kuona Acuity
Kureba kwakaratidzwa kuonekwa zvakanaka ndeyekuyera kwehuwandu hwekuona kurasikirwa. Inoyerwa nekuedza chinhu chiduku chiduku chaunogona kuziva, kazhinji pane chati chinenge mamita makumi maviri kubva ipapo. Ichi chiyero chakanyorwa sechikamu chiduku, uye 20/20 ichionekwa sechinhu chinowanzoonekwa. Kureba kwakatarisa kuchena kunowanzoedzwa nekuparadzanisa ziso rimwe nerimwe uye kuenzanisa maziso maviri pamwechete. Muzviitiko zvakawanda, chati cheziso chinoshandiswa nemhando dzakasiyana-siyana dzetsamba dzinobudirira zvishoma nezvishoma uye zviduku.
Pedyo neZvinoonekwa Zvakanaka
Pedyo kuonekwa kwakagadzikana chiyero chekuti iwe unokwanisa sei kuona zvinhu zvakapoteredza. Kazhinji inoyera anenge anenge masendimita makumi matanhatu, ndiyo nzira yakanaka yekuyera kukwanisa kwako kurarama nemabasa akadai sokuverenga kana kusona. Muzviitiko zvakawanda, pedyo nekuona kwakanaka kunowanikwa nemaziso ose akazarurwa. Iwe uchakumbirwa kubata kadhi yepafupi pedyo pamasendimita makumi matanhatu uye kuverenga mutsara muduku kudarika.
Intermediate Visual Acuity
Inyanzvi yekuona inooneka yechiratidzo chekuti unoona zvakadini parutivi rwemarefu urefu kana imwe nzvimbo pakati pedenga uye pedyo. Kunyange zvazvo kusiri kuenzaniswa kwekuongorora kweziso, kunowedzera kukosha kune vanachiremba vemaziso kuti vaongorore pakati pemaonero anooneka nokuti iyi ndiyo nzvimbo iyo makombiyuta akawanda akaiswa.
Chii Chiine 20/20 Chiratidzo Chinorevei?
Kune nzira dzakawanda dzekutarisa maonero ekuona. Chimwe chiyero chezvioni zvinoonekwa zvinowanzoshandiswa ndiyo Snellen visual acuity, inonzi zita rechiDutch ophthalmologist, Herman Snellen uye yakagadziridzwa muna 1862. Snellen visual acuity inoyerwa sechikamu chiduku uye inomiririrwa semuganhu apo kuedzwa kunoitwa pamusoro pechikomo apo chiduku chiduku chiduku chinotaridzika chinoshandisa chikamu chemaminitsi mashanu eArc uye tsanangudzo yeiyo maitiro inoshandisa inenge 1 minute yeArc. Chinhu chinonyanya kushandiswa, tsamba, mifananidzo, kana nhamba inoshandiswa kuratidzira nyaya iyo inooneka yakajeka. Uchishandisa metric system, chimiro chacho chinotarisa kurema mumamita pamusoro pehuwandu hwemashoko muM-units. Saka, 6/6 yakafanana ne20/20.
20/20 kuonekwa kwakanaka kunoreva kuti munhu anogona kuona zvishoma zvishoma kubva pamamita makumi maviri zvichienderana nemunhu ane maziso anoyevedza angaona kubva pamamita makumi maviri. Kana munhu ane ruzivo rwema 20/40, anonzi aone tsanangudzo kubva pamamita makumi maviri zvichienderana nemunhu ane maziso anowanzoona ari kubva mamita makumi mana kubva ipapo. Kazhinji kana kuenzanisira vanhu vanoona acuity inonzi 20/20. Zvisinei, kune vanhu vazhinji vanogona kuona 20/15 uye vashomanana vanogona kutowana 20/10 maonero ekuona.
Zvinokwanisika kuva nechiratidzo chinopfuura 20/20: kuwanda kwemaziso evanhu pasina maziso anoburitsa (zvakadai seabinoculars) inowanzofungidzirwa kuti iri pakati pe20/10.
Kunobva:
American Optometric Association (AOA). Kutarisa Maitiro: Chii chiri 20/20 Chiratidzo? AOA, 2006-10.