Astigmatism: he aha ia?

ʻO ka Astigmatism kahi ʻano ʻino o ke kino. Inā loaʻa ka astigmatism, ʻoi aku ka oval o ka cornea (= ʻōpuni o ka maka) ma mua o ke ʻano poepoe loa. Ke kamaʻilio nei mākou e pili ana i ka cornea i hoʻohālikelike ʻia e like me ka "pōpole rugby". No laila, ʻaʻole i hui nā kukuna māmā ma ka lae hoʻokahi o ka retina, ka mea e hoʻopuka ai i ke kiʻi ʻino a no laila, pohihihi ka ʻike ma kahi kokoke a mamao. ʻAʻole pololei ka ʻike ma nā wahi āpau.

He mea maʻamau ka Astigmatism. Inā nāwaliwali kēia kīnā ʻike, ʻaʻole pili paha ka ʻike. I kēia hihia, ʻaʻole pono ka astigmatism i ka hoʻoponopono ʻana me nā aniani a i ʻole nā ​​​​lens contact. Manaʻo ʻia he nāwaliwali ma waena o 0 a me 1 diopter a ikaika ma luna o 2 diopters.

Hiki ke astigmatism mai ka hānau ʻana. Ma hope aku, pili paha ia me nā maʻi refraction ʻē aʻe e like me ka myopia a i ʻole hyperopia. Hiki ke ʻike ʻia ka astigmatism ma hope o ke keratoconus, he maʻi degenerative e ʻike pinepine ʻia i ka wā ʻōpio a i ka wā e hoʻohālikelike ai ke kino i ke ʻano cone, kahi e hoʻoulu ai i ka astigmatism koʻikoʻi a me ka emi ʻana o ka ʻike maka. E hoʻomaopopo ʻaʻole he manawa pōkole ka astigmatism a hiki ke piʻi aʻe i ka wā.

Hiki i ka poʻe me ka astigmatism ke huikau i kekahi mau leka e like me H, M a me N a i ʻole E a me B. No laila pono e ʻike ʻia ka Astigmatism i ka wā hiki loa a ma mua o ke aʻo ʻana i ka heluhelu.

ʻOiai ʻo ka astigmatism corneal ka mea maʻamau, aia ka astigmatism i loko kahi i pili ʻole ai ka deformation i ka cornea akā aia ka lens i loko o ka maka. Inā pili nā deformations ʻelua, a laila ʻōlelo mākou i ka astigmatism āpau.

ʻO ke kuhikuhina

He mea maʻamau ka Astigmatism. ʻOi aku ma mua o 15 miliona mau kānaka Farani i ʻōlelo ʻia he astigmatic. He haʻawina¹ i alakaʻi ʻia ma ʻAmelika Hui Pū ʻIa e wehewehe i ka laha ʻana o nā hewa refractive i manaʻo ʻia ma luna o 30% o nā mea komo i loaʻa i ka astigmatism. E like ana ka laha ma Kanada.

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Hana ʻia ka ʻike o ka astigmatism e ka ophthalmologist a i ʻole optometrist. Nānā ka hope i ka hihiʻo, kokoke a mamao, a laila hoʻohana i ka refractometer, e ana i ka radii o ka curvature o ka cornea e hōʻoia i ka hele ʻana o ka astigmatism.

Nā kumu

Loaʻa pinepine ka astigmatism mai ka hānau ʻana. ʻAʻole ʻike ʻia nā kumu o kona ʻano i kēia manawa. I kekahi manawa, hiki i ka ʻoki cataract no ka laʻana, a i ʻole ka hoʻololi ʻana i ka corneal hiki ke hōʻino a hoʻololi i ia a no laila ke kumu astigmatism. ʻO ka maʻi a i ʻole ka ʻeha i ka maka ke kuleana.

Nā pilikia

Hiki i ka Astigmatism ke hoʻoulu i ka amblyopia, ʻo ia hoʻi ka emi ʻana o ka ʻike ma kekahi o nā maka ʻelua i hana ʻia e kahi ʻano ʻole o ka hoʻomohala ʻike ʻana i ka wā kamaliʻi (e laʻa, strabismus, congenital cataract, etc.) .