Ingabe ubona izinkanyezi noma ukukhanya kokukhanya ngezikhathi ezithile? Akusikhalazo esingavamile, futhi isikhathi esiningi awunakho ukukhathazeka ngakho. Uma uvale amehlo akho uphinde ubabheke, cishe uzobona amabala nokukhanya kokukhanya. Kodwa-ke, uma kwenzeka kaningi, kufanele uhlolwe amehlo akho kuphela uma ngabe kuyisibonakaliso sento engathà sina.
Phosphenes
Izinkanyezi futhi zikhanyisa ngezinye izikhathi zibona zibizwa ngokuthi "phosphenes," okubonakalayo okubonakalayo ekuboneni ukukhanya ngaphandle kokuba ukukhanya kungene empeleni.
Igama elithi "phosphene" livela kumazwi esiGreki phos (ukukhanya) nephainein (ukukhombisa).
I-phosphenes ejwayelekile kakhulu ingcindezi phosphenes. Ukubhoboza amehlo ngenkathi kuvaliwe kuvusa amangqamuzana e- retina . I- nertic optic ihumusha lokhu kucindezela emifanekiso ehlukahlukene. I-phosphenes yokucindezela ingakwazi ukuhlala imizuzwana embalwa ngemva kokuyeka ukugubha futhi amehlo avuliwe, okuvumela ukuba ama-phosphenes abonakale.
U-Isaac Newton wabonisa isibonelo se-phosphene ye-pressure ngokucindezela ngokucophelela ohlangothini lweso ukuveza indandatho enemibala yokukhanya ohlangothini oluphambene. Enye phosphene ejwayelekile "ukubona izinkanyezi." Ngesinye isikhathi umuntu angabona ukukhanya noma izindawo zokukhanya ezivela ekusikeleni, ukukhwehlela okunzima, ukushaya okuqinile ekhanda, noma ukucindezelwa kwegazi okuphansi, njengokungathi ngemva kokuma ngokushesha.
Ngenkathi izinkanyezi zibona ngokuvamile zibangelwa ukugqugquzelwa kwemishini, zingase zibangele ukugqugquzela okwenziwa ngamashini nokuxilonga kwe-neurons ye-cortex ebonakalayo noma kwezinye izingxenye zeso.
Abacwaningi baye bahlakulela izinhlelo ezikhuthaza phosphenes ukusiza ukubuyisela umbono kubantu abalahlekelwe umbono wabo ophuthelwe ezingozini. Ama-electrode asetshenziselwa esikhwameni sokukhiqiza i-phosphenes. Ucwaningo luye lwabonisa ukuthi uma i-cortex ebonakalayo ivuselelwa ngokwanele, i-phosphenes ikhiqizwa engxenyeni engezansi yendawo ebonakalayo.
Valsalva Maneuver
Umkhondo we-valsalva yisenzo sokuphefumula ngokweqile ngenkathi uvala umlomo nekhala. Kudala ukucindezela emzimbeni nasenhloko. Ngokuvamile, akuyona into enempilo kakhulu yokuyenza, nakuba ukusetshenziselwa ukusetshenziselwa ukusiza ukulawula ukucindezeleka kwenhliziyo.
Ngezinye izikhathi lokhu kucindezela kungabangela ukuba ubone izindawo zokukhanya ezingase zenzeke ngemva kokukhipha noma ukukhwehlela kanzima. Lokhu kungabangelwa nokucindezeleka kakhudlwana lapho uphakamisa into enzima kakhulu noma uzama ukunyakaza kwamathumbu.
I-Postural noma i-Orthopotatic Hypotension
I-Orthostatic hypotension ibangelwa ukuwa kwegazi ngokungazelelwe. Izindlela zomzimba zomzimba ezizama ukugcina ukucindezelwa kwegazi nokugeleza kwegazi kuya ebuchosheni zigijima njalo, futhi inhliziyo ikhuthazwa ukwandisa umkhiqizo.
Izitsha zegazi emzimbeni wethu nazo ziyashintsha, ezithinta ukucindezeleka kwegazi. Lezi zinguquko zithinta ubuchopho, futhi sibona izinkanyezi. Lokhu kwenzeka uma sesibekwe isikhathi eside futhi simi masinyane kakhulu.
I-Ophthalmic Migraines
Amanye ama-migraine ane-aura ebonakalayo abantu ababonayo, ngokuvamile evame ukuqala ikhanda. Abanye abantu abakaze bathole ikhanda kodwa bavele babone i-aura ebonakalayo. I-aura ingaba ngembala emihle, ukukhanya kokukhanya, kanye nezinye izinkanyezi.
Bavame ukugcina imizuzu engu-20 bese behamba. Uma ikhanda lilandela ukukhanya, kubizwa ngokuthi "ikhanda le-migraine." Uma lokhu kukhanya noma imigqa yokukhanya kungenzeki ngaphandle kwekhanda, kubizwa ngokuthi "i-ophthalmic migraine," noma i-migraine ngaphandle kwekhanda.
Ukuthuthwa Kwama-Vitreous Posterior
I-posterior vitreous detachment (PVD) yinto evamile evame ukubangelwa ukuguga. I-vitreous, ephikisana ne-retina, yinto efana ne-jelly egcwalisa phakathi kweso. Yenziwe kakhulu ngamanzi, i-vitreous fluid inikeza iso iso layo.
Njengoba sakhula, ukwakhiwa kwezinguquko ze-vitreous futhi kuqina kancane.
Lolu shintsho ngezinye izikhathi lubangela ukuthi i-vitreous idonse ku-retina. Uma amandla okudonsa eba namandla ngokwanele, i-vitreous ingase ihluke ngempela kwi- retina . Uma lokhu kwenzeka, sibona ukukhanya kokukhanya noma izinkanyezi. Iningi le-PVD liyakhathaza kodwa alilimazi. Kodwa-ke, cishe amaphesenti angu-5 esikhathi, i-PVD ingabangela izinyembezi noma i-detectment.
Izwi elivela
Nakuba ngokuvamile kungenabungozi, ukukhanya kokukhanya okuvamile kungaba isibonakaliso sokuxwayisa sento engathà sina. Kuzohlolwa ukuhlolwa kwamehlo okuphelele ukuze kutholakale imbangela. Abantu abazalwa beyimpumputhe abakaze babone phosphenes. Kodwa-ke, uma ulahlekelwa umbono wakho ngenxa yokugula noma ukulimala, ngokuvamile ngeke uqede ukulahlekelwa umsebenzi wonke wokubukwa. I-Phosphenes ingavela ezingxenyeni ezihlukene zesistimu ebukwayo, ngakho-ke abantu ababengababona bangase bahlale benamandla okubona ama-phosphenes.
> Umthombo:
> Kahawita S, uSimon S, Gilhotra J. Amaflethi kanye nezindawo ezihamba phambili - indlela yokusebenza nokuhlola . I-Aust Fam Physician. 2014 Ngo-Ephreli; 43 (4): 201-3.