A mafi yawan lokuta na rashin hankali na gani, ana lura da myopia (rashin tsaro) ko hypermetropia (hangen nesa). Gayyakan tabarau a karkashin irin wannan nau'in an yi amfani da shi don neutralizing su tare da taimakon watsawa ko tattara gilashin.
Yaya za a ƙayyade ƙirar yayin da za a zabi gilashin?
A madadin gilashin mai haƙuri mai nisa ne na nisan mita 6 daga kowane tebur na musamman. Kowane ido yana nazari daban. Tun daga saman, mai haƙuri karanta haruffa kowane layi. Layin karshe na ƙarshe yana nuna alamar gani. Bayan haka, raunana (dogon lokaci), sa'annan kuma ana amfani da tabarau masu mahimmanci (gajere) a idon. Mai haƙuri ya sake karanta layin karshe, wanda zai iya gani. Gilashin filaye mafi karfi ya nuna nauyin farfadowa.
Idan hangen nesa ya ɓace daga gilashin faɗakarwa, to, ana iya duba mataki na iya amfani da myopia. Anyi wannan tare da taimakon gilashin concave. Idan ba a taimaka gilashin gilashin gilashin ba, ana haifar da maƙasudin ci gaba da ɓoye na gani.
Gilashin tabarau da diopters
Gilashin da dama tare da diopters - gilashi-chameleons (photochromic). Suna amfani da ruwan tabarau na photochromic, wanda canza launin, watau. duhu, tare da aikin rakoki ultraviolet. Yi la'akari da cewa a cikin ɗakunan da aka yi wa ɗamara ba'a yi duhu ba, tun da gilashin siliki ba ya bari izinin ultraviolet.
Gilashin kataran wasan kwaikwayo masu haske suna haskaka cikin minti 3, yi duhu don minti daya. A wannan yanayin, ruwan tabarau dole ne canza launi a lokaci guda.
Jirgin karewa na iya zama tare da diopters. Ana amfani da su a cikin wasanni masu yawa, cycling, motar motsa jiki, hawa a cikin duwatsu, sararin sama, da dai sauransu. Sakamakonsu shi ne cewa an yi su da kayan abu mai mahimmanci, don haka wadannan tabarau suna kare idanu daga samun matsuran ƙwayoyi.
Wutan lantarki don karewa tare da diopters kare daga UV radiation, da kuma na musamman shafi a ciki na ruwan tabarau ya hana su daga fogging. Lokacin zabar irin wannan tabarau, ya kamata a tuna cewa ruwa yana inganta tasirin ruwan tabarau.
Gilashin ido don yin tuki tare da diopters, baya ga gyarawa da gani, dole ne tabbatar da kawar da haskakawa (faɗakarwa), samar da mafi bambanci. Irin waɗannan nau'i-nau'i ana iya yin su da siffofin photochromic.
Ga mutanen da suke gani da matalauta, yanzu za ka iya zaɓar ko zaɓin tabarau tare da diopters. Don ware nauyin rashin jin dadi, kana buƙatar zaɓar samfurar tabarau na madaidaici (don haka ruwan tabarau suna cikin wannan jirgin a gaban idanu).
Mutane da yawa a lokacin da aiki a kwamfutarka amfani da tabarau na kwamfuta, wanda, godiya ga filtata na musamman, rage rage a kan idanu. Idan kana da matsaloli na gani, yana yiwuwa a hada irin wannan tabarau tare da ruwan tabarau mai lamba. Wani zaɓi shine don amfani da tabarau na kwamfuta tare da diopters masu dacewa.
Idan ba za ka iya gani sosai ba, kuma ta haka ne zancen idanu ya bambanta, ana sanya gilashi da diopters daban-daban.
Ga mafi yawan mutanen da suke gani tare da matalauta, ana bukatar nau'i-nau'i nau'i-nau'i biyu - don "nesa" da kuma "kusa" (lokacin karatun). Amma akwai damar da za a yi amfani da tabarau daya da dioptries, duka don karatu da wasu lokuta. Lensuna a cikin wadannan tabarau ana kiransa multifocal.
Abubuwan da ba tare da zane-zane (gilashi na al'ada) ana amfani dasu azaman kayan haɗi, don jaddada hoton.
Idan kana son gilashin kayan ado tare da dioptries, ka lura cewa a cikin kakar da ke zuwa a cikin fashion za su kasance da tabarau "ido cat", "dragonfly ido", tabarau a manyan Frames, tare da kayan ado.