Crystalline lens chungchanga hriat tur i neihte

Engtin nge kan mit hian camera tha tak ang maiin thil hla tak leh hnai tak takah chiang takin a en thin tih i ngaihtuah ngai em? Kan mit peng pawimawh tak pakhat hian he hna mak tak hi a pui a ni. Chu chu "lens" a ni. Vawiin hian he lens te tak te, mahse hlu tak mai hi kan sawi dawn a ni.

Mit lens chu eng nge ni? A awlsam zawngin i hrethiam ang u.

Mit lens hi camera-a lens awm ang chiah a ni. Pangpar mawi tak thlalak i lak lai kha han mitthla teh. Camera lens hian pangpar atanga êng chu a khawlkhawm a, a focus a, camera hnung lama sensor-ah a thawn a ni. Chu chu thlalak chiang tak siam a nih lai a ni.

Kan mit lens hian hetiang chiah hian a ti a ni. Kan mit chhung thuk takah awm, a langtlang vek a, a curved structure a ni. Mit chhunga êng lut chu he lens kaltlangin a kal a, hmun khatah a focus a, mit screen ang maia retina an tih hmunah a tla a ni. He retina hi kan mit chhunga camera sensor a ni. Chuta tang chuan chu data chu thluak lamah a kal a, chu chu image angin kan hmu a ni.

He lens te tak te hi eng nge thleng tak tak?

Mit lens hnathawh ber chu focusing a ni . Mahse hei hi i ngaihtuah aiin a buaithlak zawk.

Tlâng hla tak i en a, a dawt leh second-ah chuan i kuta lehkhabu chu i chhiar ang tih han mitthla teh. Hmun hla pahniha chiang taka hmuh tur chuan mit lens hian a pianzia a thlak a ngai a ni.

• Hmun hla takah i en chuan: lens chu a flatter deuh deuh thin.
• Hmun hnai taka en chuan: Lens chu a rawn chho deuh a, a round deuh bawk.

Hetianga automatic-a pianzia thlak danglam theihna hi hlat zawng hrang hranga chiang taka kan hmuh theihna a ni. Mahse hre reng ang che, mit hmalam a mit chiang tak cornea hian focusing power 70% vel a ti a ni. Lens hian a bak 30% chu fine-tuning hna a thawk a ni.

Mit lens hi khawiah nge a awm?

Darthlalang atanga i mit ngei i en chuan mit rawng (kan case-ah chuan brown/black) chu i hmu thei ang. Iris kan ti a. A laiah chuan a dum circular part te tak te chu pupil an ti a. A awlsam zawngin, he pupil hi mit chhunga êng luhna kawngkhar a ni.

Kan mit lens hi he mit (cornea) hnung chiah hian a awm a. Chumi awmzia chu êng chu mit (cornea) kaltlangin a lut hmasa a, chutah chuan lens-ah a tla a, chuta ṭang chuan, mit (retina)-ah a innghat tihna a ni.

He lens mak tak hi eng atanga siam nge ni?

Mit lens hi thil siam mak tak a ni tak zet a ni. Protein chi khat bik ``Crystallins'' tih atanga siam a ni. Mit lens hi kan taksa chhunga tissue zawng zawng zingah protein tamna hmun a ni. Heng protein bik avang hian lens hian a transparent nature leh focusing power a nei thin.

A pawimawh ber chu he lens chhunga cell te hi an puitlin chhoh zel chuan an nuclei ang chi thenkhat an hloh thin. Chuvangin lens chu engmah tibuaitu awm lovin a transparent vek a ni. Mahse hei hian side effect a nei a ni. Nucleus a awm loh avangin heng cell te hi an inthen darh thei lo va, a thar an lo thang lian thei lo. Chumi awmzia chu kan pian tirh atanga kan neih lens cell te hi kan dam chhung zawngin a inang vek tihna a ni. Pawn lamah cell thar an pung khawm a, mahse cell hlui chu a laiah an pungkhawm thung. Thingkung zungbun ang maiin. Hun a kal zel a, a laiah cell hlui ber berte chu an chak lo tan ta a ni.

Kan tar chhoh zel chuan mit lens lama harsatna (cataracts leh mitdelna) .

Hun a kal zel a, a bik takin ni chhuahna leh boruak dang avang hian kan mit lens chhunga protein cell hlui te chu a chhe tan a, a chhe tan bawk. Hei hian cell-te chu an transparency a hloh a, cloudy-ah a awm a, cloudy-ah a siam bawk. Hei hi "Age-related Cataracts" kan tih chu a ni.

Tin, kan tar chhoh zel chuan lens hian a flexibility a hloh thin. Chumi awmzia chu hnai taka en chuan spherical nih theihna a hloh tihna a ni. Hei hi thil hnaih taka awmte chu a fiah lo deuh a, a bik takin lehkhabu emaw chanchinbu emaw chhiar hian a ni. Hetiang dinhmun hi `(Presbyopia)` kan ti a.

Cataract a lo awm hian eng ang nge a nih?

Cataract a lo awm chuan khawvel hi glass bawlhhlawh atanga thlir ang maiin a lang. Engkim hi a blurry leh foggy ang maiin a lang. A tirah chuan he clouding hi hmun tlemteah a intan thei a, hun kal zelah lens pumpuiah a darh thei bawk. Pawn lam atanga entu tan chuan mit lai takah chuan mit dum (black pupil) chu dum ni lovin, a dum (grayish-white) angin a lang thei a ni. (A châng chuan, genetic reasons vangin naute hi mitdelna neia piang an ni a, hei hi hriat theihna tura ṭanpui theitu chhinchhiahna lian ber pakhat a ni.)

Hmalam thlir theihna (Presbyopia) .

Lens flexibility a tlahniam chuan i hnaih ber thilte ngaihtuah chu i tan a harsa ta hle. Kan in lama tarte kut phar leh hla taka chanchinbu chhiar lai i hmu tawh mai thei. Hei hi a chhan chu a ni. A nih loh leh, lehkhabu i chhiar emaw, phone i en emaw hian i mit chu a chau nghal mai thei.

Heng natnate hi eng enkawlna nge ni?

Tunah chuan heng harsatna pahnih hi enkawlna tha tak tak a awm tawh a, chuvangin hlauhna tur a awm lo.

Hmuh theihna hnai tak (Presbyopia) enkawlna .

Hei hi kum upat ruala lo awm fo thin a nih avangin a chinfel dan tur engemaw zat a awm a:

• Glasses: Thiltihtheihna dik tak nei glasses vuah hi a awlsam ber leh hman tlanglawn ber a ni.
• Contact Lenses: Chu chu glasses duh lo tan chuan duhthlan tur tha tak a ni.
• Mit Drops: Tunlai damdawi thenkhat hian rei lo te chhungin near vision a ti tha thei a, eng emaw chen chu a ti tha thei a ni.
• Vision Correction Surgery: He natna hi laser hmanga enkawlna ang chi hmangin siamthat theih a ni.

I doctor chuan i mit dinhmun a enfiah ang a, i tan eng enkawlna nge tha ber tih a hrilhfiah ang che.

Mitdel enkawlna

Mitdel enkawlna awmchhun leh hlawk ber chu operation hi a ni. Tunah chuan hei hi khawvela surgery tih tam ber leh him ber pawl a ni ta.

Hei hian surgeon chuan i cloudy natural lens chu la chhuakin artificial lens (Intraocular Lens, or IOL) hmangin a thlak a ngai a ni. Hei hi enkawlna hlawhtling tak a ni a, mi tam tak chuan operation hnuah mit fiah tak an nei leh thin.

A châng chuan mitdelna a lo awm hmain hetiang artificial lens implantation surgery hi near/far vision problems siamṭhat nan an ti ṭhin. Chu chu `(Refractive Lens Exchange)` tih a ni.

Engtin nge kan mit lens te hi kan venhim theih ang?

Tar hi kan chawlhsan thei lo nain, kan mit chhunga lens chu a chak lo vat loh nan leh a chhiatna a tlem theih nan thil engemaw zat kan tih theih a awm.

• Ni laka invenna: Ni eng chak takah ultraviolet rays hi mit lens tan a pawi hle. Chuvangin ni chhuahna hmuna chhuah dawnin sunglass quality tha tak ha thin ang che.
• Meizial zuk loh: Meizial zuk leh secondhand smoke nena inzawmna hian mitdelna (cataract) vei theihna a tipung hle.
• Diabetes control: Zunthlum i vei chuan uluk taka control a pawimawh hle a, controlled diabetes hi mitdelna thlentu lian tak a nih avangin.
• Mit enfiah fo: Doctor-in i mit enfiah fo, a bik takin kum 40 i tlin hnuah, harsatna awm apiang hriat hmasak leh enkawlna zawng turin a pui thei a ni.

Kan mit lens hi thil danglam bik a ni a, fiah taka hmuh theihna atana pawimawh tak a ni. Hun kal zelah a danglam zel hi thil pangngai a ni. Amaherawhchu, kan hriat chian a, kan mitte uluk taka kan enkawl chuan kan dam chhungin khawvel hi chiang takin kan hmu thei a ni.