Astigmatism: chii ichocho?

Astigmatism chinhu chisina kujairika checornea. Pakaitika astigmatism, cornea (= superficial membrane yeziso) ine oval pachinzvimbo chekuve yakaurungana zvakanyanya. Tiri kutaura nezve cornea yakaita se "rugby ball". Nekuda kweizvozvo, maranzi emwenje haasanganise pane imwechete uye yakafanana poindi yeretina, iyo inoburitsa mufananidzo wakamonyaniswa uye nekudaro, kusaona kwakajeka zvese zviri pedyo nekure. Chiono chinova chisina kujeka pamadaro ese.

Astigmatism yakajairika. Kana ichi chirema chekuona chisina kusimba, kuona kunogona kusakanganiswa. Muchiitiko ichi, astigmatism haidi kururamiswa nemagirazi kana kuonana lenzi. Inoonekwa isina simba pakati pe0 uye 1 diopter uye yakasimba pamusoro pe2 diopters.

Astigmatism inogona kuitika kubva pakuzvarwa. Gare gare, inogona kuve yakabatana nemamwe matambudziko ekuramba akadai se myopia kana hyperopia. Astigmatism inogonawo kuoneka ichitevera keratoconus, chirwere chinopera simba chinowanzoonekwa mukuyaruka uye panguva iyo cornea inotora chimiro chekoni, izvo zvinokonzera astigmatism yakaoma uye kuderera kwekuona acuity. Ziva kuti astigmatism haisi yenguva pfupi uye inogona kuwedzera nekufamba kwenguva.

Vanhu vane astigmatism vanogona kuvhiringidza mamwe mavara akadai saH, M uye N kana kunyange E uye B. Astigmatism inofanira kuonekwa nokukurumidza sezvinobvira uye kunyanya, vasati vadzidza kuverenga.

Kunyange zvazvo corneal astigmatism ndiyo yakanyanya kuwanda, pane astigmatism yemukati apo deformation haikanganisi cornea asi lens iri mukati meziso. Kana kukanganiswa kuviri kwakabatana, tinobva tataura nezve astigmatism yakazara.

Kuwanda

Astigmatism yakajairika. Vanopfuura mamirioni gumi nemashanu vanhu vekuFrance vanonzi vane astigmatic. Chidzidzo¹ yakaitwa muUnited States kutsanangura kuwanda kwezvikanganiso zve refractive zvakaratidza kuti pamusoro pe30% yevatori vechikamu vakatambura ne astigmatism. Kupararira kwaizove kwakafanana muCanada.

chirwere

Kuongororwa kweastigmatism kunoitwa neophthalmologist kana optometrist. Iyo yekupedzisira inotarisa chiono, pedyo uye kure, uye kushandisa refractometer, inoyera radii ye curvature ye cornea iyo inosimbisa kuvapo kwe astigmatism.

Zvinokonzera

Astigmatism inowanzoitika kubva pakuzvarwa. Zvikonzero zvekuonekwa kwayo panguva ino hazvizivikanwe. Dzimwe nguva, kuvhiyiwa kwecataract semuenzaniso, kana kuisirwa cornea kunogona kukuvadza nekuikanganisa uye nekudaro kukonzeresa astigmatism. Utachiona kana kukuvadzwa kweziso kunogonawo kukonzera.

Matambudziko

Astigmatism inogona kukonzera amblyopia, i.e. kuderera kwekuona mune rimwe remaziso maviri kunokonzerwa neabnormality mukukura kwekuona paudiki (semuenzaniso strabismus, congenital cataract, nezvimwewo).