Paunopinda muchitoro chegirazi woedza kutenga magirazi, une mhando dzakasiyana dzemagirazi zvichienderana nechiremba wako. Asi vanhu vazhinji vanovhiringidzika nemashoko ekuti single vision, bifocal uye progressive. Aya mazwi anoreva kuti magirazi ari mumagirazi ako akagadzirwa sei. Asi kana usina chokwadi nezverudzi rwemagirazi aunoda chiremba wako, heino pfupiso yekukubatsira kutanga.
1. Chii chinonzi Single Vision Lenses?
Lenzi imwe chete yekuona chinhu chimwe chete igirazi rine mushonga mumwe chete. Rudzi urwu rwelenzi runoshandiswa pakurapa vanhu vanoona zviri pedyo, vanoona zviri kure, vane astigmatism, kana kuti vane musanganiswa wezvikanganiso zve refractive. Kazhinji, magirazi ekuona chimwe chete anoshandiswa nevanhu vanoda simba rakafanana rekuona kure uye pedyo. Zvisinei, kune magirazi ekuona chimwe chete akagadzirirwa chinangwa chaicho. Semuenzaniso, magirazi maviri ekuverenga anoshandiswa pakuverenga chete ane lenzi imwe chete yekuona.
Lenzi yekuona imwe chete yakakodzera vana vazhinji nevakuru vadiki nekuti havawanzo gadzirisa kuona kwavo zvichienderana nedaro ravo. Mishonga yako yekuona imwe chete inogara iine chinhu chakatenderera senhamba yekutanga pane yako uye inogonawo kusanganisira chinhu chesilinda chekugadzirisa astigmatism.
2. Chii Chinonzi Bifocal Lenses?
Magirazi maviri ane nzvimbo mbiri dzakasiyana dzekugadzirisa kuona. Nzvimbo idzi dzakakamurwa nemutsetse wakasiyana wakamira wakatarisana negirazi. Chikamu chepamusoro chegirazi chinoshandiswa kureva kure, nepo chikamu chepasi chinoshandiswa kuratidza kuona pedyo. Chikamu chegirazi chakatsaurirwa kuona pedyo chinogona kuumbwa nenzira mbiri dzakasiyana: chikamu cheD, chikamu chakatenderera (chinoonekwa/chisingaonekwe), chikamu chakakombama uye E-line.
Magirazi eBifocal anowanzo shandiswa kana munhu asingawanzo kwanisa kushandisa magirazi eprogressive kana kuti kuvana vadiki vane maziso anopenya pavanoverenga. Chikonzero chinoita kuti asanyanya kushandiswa ndechekuti pane dambudziko rinowanzo konzerwa nemagirazi eBifocal anonzi "image jump", umo mifananidzo inoita seinosvetuka maziso ako achifamba pakati pezvikamu zviviri zvegirazi.
3. Chii Chinonzi Progressive Lenses?
Magadzirirwo emalenzi eprogressive matsva uye akakwirira kupfuura malenzi e-bifocal. Malenzi aya anopa simba rinobva kumusoro kwelenzi kusvika pasi, zvichipa shanduko dzisina musono kune zvinodiwa zvakasiyana zvekuona. Malenzi eprogressive eyeglass anonziwo malenzi e-bifocal asina mutsauko nekuti haana mutsetse unooneka pakati pezvikamu, izvo zvinoita kuti anyatso fadza.
Uyezve, magirazi emaziso anofambira mberi anoitawo kuti pave nekuchinja kwakanaka pakati penzvimbo dziri kure, dziri pakati nepakati, uye dziri pedyo nechikamu chechiremba wako. Chikamu chepakati chelenzi chakanakira mabasa ari pakati nepakati akadai sekushanda pakombiyuta. Magirazi emaziso anofambira mberi ane sarudzo yekugadzira koridho refu kana pfupi. Koridho ndiyo chikamu chelenzi chinokupa mukana wekuona daro riri pakati nepakati.
Muchidimbu, malenzi ekuona kamwe chete (SV), malenzi ekuona kaviri, uye malenzi ekuona zvishoma nezvishoma anopa mhinduro dzakasiyana dzekugadzirisa kuona. Malenzi ekuona kamwe chete akakodzera daro rimwe chete (pedyo kana kure), nepo malenzi ekuona kaviri uye malenzi ekuona zvishoma nezvishoma anotarisa kuona kwepedyo nekure mune lenzi rimwe chete. Malenzi ekuona kaviri ane mutsetse unooneka unoparadzanisa zvikamu zvepedyo nedaro, nepo malenzi ekuona zvishoma nezvishoma achipa nzira yekuchinja pakati pedaro pasina mutsetse unooneka. Kana muchida rumwe ruzivo, ndapota inzwai makasununguka kutibata.