Likhalase tse Khethehileng tsa Leihlo la Acetate tsa Mebala e Mebala Katse ea feshene BV210611

Joang ho khetha le ho roala likhalase tsa letsatsi?

Likhalase tsa letsatsi li boetse li bitsoa sunshades. Libakeng tsa lehlabula le tse lithaba, hangata batho ba roala likhalase tsa letsatsi ho qoba ho tsosoa ke khanya e matla le ho thibela tšenyo ea mahlaseli a kotsi mahlong. Ka ho ntlafala ha maemo a bophelo, batho ba ananela mahlo a bona haholoanyane. Lehlaseding la letsatsi, mahlaseli a kotsi a kotsi mahlong. Likahare tsa mahlaseli a kotsi mahlaseling a letsatsi a fihlang holim'a lefatše li etsa hoo e ka bang 7%. Cornea le lense ea leihlo la motho ke lisele tsa mahlo tse kotsing ea ho senyeha ha UV. Cataract ke lefu la mahlo le amanang haufi-ufi le mahlaseli a ultraviolet. Mafu a mahlo a kang solar keratitis, corneal endothelial injury, eye macular discoloration, le retinitis kaofela li amana le mahlaseli a ultraviolet. Likhalase tsa letsatsi tse tšoanelehang li na le mosebetsi oa ho thibela mahlaseli a ultraviolet le a infrared. Ka hona, ho ka boleloa hore ho roala likhalase tsa letsatsi lehlabula ke e 'ngoe ea mekhoa e sebetsang ea ho sireletsa mahlo mahlaseling a ultraviolet.

Likhalase tsa letsatsi ka kakaretso li arotsoe ka lihlopha tse peli: tse mebala e khanyang le tse lefifi, 'me li na le mebala e sa tšoaneng. Ho ahlola boleng ba likhalase tsa letsatsi, ho tsepamisitsoe maikutlo ho matšoao a 'maloa a tekheniki joalo ka matla a vertex le matla a prism, litšoaneleho tsa karo-karolelano ea phetisetso, boleng ba bokaholimo le bofokoli ba kahare, ho nepahala ha kopano le litlhoko tsa sebopeho.

Likhalase tse ntle tsa letsatsi li ka etsa moriti le ho khabisa bokantle ba hau. Empa 'marakeng, boemo ba sebele ha bo na tšepo. Bahoebi ba bang ba lebala ka phaello, ba nka monyetla oa ho se utloisise ha bareki boleng ba likhalase tsa letsatsi, 'me ba sebelisa likhalase tsa lifensetere tsa boleng bo tlaase, tsa theko e tlaase kapa lisebelisoa tse ling tse tlaase ho etsa likhalase. Lisebelisoa tsena li na le ho se tšoane hantle, li na le li-streaks, li-bubble le litšila tse ling, li ke ke tsa thibela mahlaseli a ultraviolet, 'me ha li finyelle litlhoko tsa fisioloji tsa leihlo la motho. Ho feta moo, tšebeliso ea lilakane tsa polasetiki tse tlase tse nang le phetisetso ea leseli e tlase haholo, empa phetisetso e phahameng ea ultraviolet ho etsa likhalase tsa letsatsi e tla baka kotsi ho bareki.

Joang ho khetha le ho roala likhalase tsa letsatsi? Litsebi li hopotsa bareki hore ba se ke ba ela hloko feela mokhoa oa likhalase tsa letsatsi, empa hape le boleng ba bona ba tlhaho. Bakeng sa likhalase tsa letsatsi tse tšoanelehang, phetisetso ea mahlaseli a ultraviolet a maqhubu a malelele a nang le maqhubu a pakeng tsa 315nm le 380nm ha ea lokela ho feta 10%, mme phetisetso ea mahlaseli a ultraviolet a mahareng a maqhubu a pakeng tsa 280nm le 315nm e lokela ho ba zero. Ho roala likhalase tsa mofuta ona ho ka sireletsa cornea, lense le retina ea mahlo tšenyong ea UV. Likhalase tse ling tse theko e tlaase ha li khone feela ho sefa mahlaseli a ultraviolet, empa hape li thibela leseli le bonahalang, ho etsa hore ho pepeseha ha mahlaseli a ultraviolet ho hlake haholoanyane. Ho molemo hore u se ke ua apara likhalase tse joalo tse tlaase.

Likhalase tsa letsatsi ke tsa letoto la seipone se bataletseng. Ho ea ka litekanyetso tsa naha, likhalase tsa letsatsi li lumelloa feela ho ba le diopter ea plus or minus 8 degrees, 'me ka nģ'ane ho phoso ena ho na le sehlahisoa se tlaase. Ho latela ho sibolloa ha likhalase tsa letsatsi 'marakeng ke bafuputsi, hoo e ka bang 30% ea likhalase tsa letsatsi li na le dioptara e fetang mamello,' me tse ling li bile li le holimo ho likhato tse 20. Litsebi li bontša hore bareki ba nang le pono e tloaelehileng ba roala likhalase tsa mofuta ona, joalo ka ho roala likhalase tsa myopia kapa hyperopia. Kamora lehlabula, bareki ba tla "koetlisetsoa" ho bakuli ba myopia kapa hyperopia ka likhalase tse tlase tsa letsatsi. Ha u e-ba le matšoao a kang ho tsekela, ho nyekeloa ke pelo, le khanya ka mor’a ho roala likhalase tsa letsatsi, u lokela ho khaotsa ho li roala hang-hang.