Ukubala umbala oyimpumputhe, noma ukubonakala kombala kumbala, kubhekisela ekutheni umuntu akakwazi ukuhlukanisa kahle imibala ethile. Izinkinga zombono wombala zivela ekungakwazi ukubona ama-shade ahlukene wombala ukuze angakwazi ukubona imibala ethile. Abantu abaningi bakholelwa ngephutha ukuthi ukuthi iyimpumputhe ukubuka izwe ngombala omnyama nomhlophe kuphela , kodwa ukuphunga kombala okuphelele akuvamile.
Umuntu oyimpumputhe wembala ngokuvamile unenkinga yokuhlukanisa phakathi kwemibala ebomvu neyoluhlaza, ukuwashaya ngombala ofanayo. Uhlobo oluthile oluthile lobumpumputhe bombala luhilela imibala eluhlaza okwesibhakabhaka nokuphuzi.
Izimbangela
Umbala oyimpumputhe ubangelwa amangqamuzana e-retina engasebenzi ngendlela engalungile. Amaseli e-cone akhethekile, anesibopho sombono wombala, akakwazi ukuthumela izimpawu ezifanele ebuchosheni. Umbala oyimpumputhe uvame ukuzuza ifa. Amaphesenti angaba ngu-8 wamadoda nengxenye eyodwa yabesifazane abanemibono yembala abanamandla. Abesilisa abaningi banesifo esiyinkinga kunabesifazane.
Ngezinye izikhathi, izifo ezithile zeso zidala ubumpumputhe bombala, okubhekwa ngokuthi "ubuwula obuningi bombala." Ukuguga kungabangela futhi lesi sifo; njengoba i-lens ibumnyama ngokudala, abantu abadala kungenzeka bakuthole kunzima ukuhlukanisa imibala.
Izimpawu
Uphawu oluyinhloko lobumpumputhe bombala kunzima ukuhlukanisa phakathi kokubomvu nokuhlaza noma okwesibhakabhaka nokuphuzi.
Ngokuvamile abazali bazosola ukuphunga kombala lapho ingane yabo ilukhuni ukufunda imibala. Izingane ezinenkinga esikoleni kufanele zihlolwe ubuphofu bombala, njengoba izinto eziningi zokufunda zixhomeke kakhulu kubafundi abakwazi ukuhlukanisa phakathi kwemibala.
Ukuxilongwa
Isivivinyo esivame kakhulu sokuxilonga ubuwula bombala yi-Ishihara test.
Ukuhlolwa okusheshayo nokulula kuqukethe uchungechunge lwezithombe ezenziwe ngamachashazi anemibala. Phakathi kwamachashazi kukhona isibalo, ngokuvamile inombolo, eyenziwe ngamachashazi ombala ohlukile. Umuntu onombono ojwayelekile wombala uzokwazi ukubona inombolo, kodwa umuntu oyimpumputhe wombala uzobona inombolo ehlukile noma akukho nhlobo nhlobo.
Olunye uvivinyo olusetshenziselwa ukuhlonza ubuphofu bombala lubizwa ngokuthi ukuhlolwa kwesilungiselelo, lapho isiguli siceliwe ukuthi sihlele iqembu lama-chips ezinemibala ngendlela ethile.
Ukwelapha
Ngeshwa, akekho ukwelashwa kobuphofu bombala. Abantu abanokukhubazeka kombala, Nokho, bafunde izindlela zokubhekana nalesi sifo. Iziguli zivame ukuzifundisa ukuthi zingahlukanisa kanjani phakathi kwemibala ehlukene nemibala emibala.
Abanye odokotela banquma ukuthi i -lens-corrective lenses , kuncike ekubambeni kokubonakala kombala. Ukwengeza, isofthiwe yekhompuyutha ithuthukiswe ukusiza labo abanenkinga yokubuka umbala.
Umthombo:
Association American Optometric, Umbala Wezinkinga. 17 Jul 2007.