Glasses vuah i nih chuan i prescription-a number awmte chauh ni lovin thil dang ngaihtuah a ngai a ni. Chutiang bawka pawimawh, mahse hriat hlawh lo zawk pawh ni thei, i hriat loh pawh a awm bawk. Chu chu Pupillary Distance, a tawi zawngin ‘PD’ an tih tehna chu a ni. Eng nge a nih, engvangin nge a pawimawh em em a, in lama teh dan tur te han thlir ila.
A awlsam zawngin Pupillary Distance (PD) hi eng nge ni?
Pupillary Distance (PD) chu i mit chhunga ring dum (pupils) pahnih center point inkar hlat zawng a ni. Millimeter (mm)-a teh a ni. A chang chuan ``Interpupillary Distance - ID'' an ti bawk.
Ngaihtuah teh, glasses siam i tum lai hian power point sang ber chu i iris hma chiah chiah a awm theih nan lens chu i siamrem a ngai a ni. Chutiang a nih loh chuan chiang takin i hmu lovang. Hei hi PD tehna hi siamthatna dik tak siam nan a pawimawhna hmun a ni. Online-a glasses i lei dawn a nih chuan i prescription nen hian he PD measurement hi i mamawh ngei ang.
In lama i PD hi engtin nge i teh ang?
He tehna hi a tak taka hmuh theih dan tha ber chu trained professional, i mit doctor emaw optician emaw te tih tir hi a ni a, chu chu a dik ber a nih avangin.
Amaherawhchu, mahni tehna i duh chuan chutiang pawh chu tih theih dan a awm. I mamawh chu millimeter (mm)-a chhinchhiah tehna tape leh darthlalang chauh a ni. A châng chuan chutiang atana siam special measuring tape emaw smartphone app emaw pawh i hmu thei bawk. Mahse, mahni in teh emaw, app hmanga teh emaw hian a dikna chu a off deuh thei tih hre reng ang che.
I in teh duh chuan...
Hei hi nangmah chauha i tih a nih chuan tlem tal i fimkhur a ngai a ni. Heng step te hi zawm rawh.
| Step hrang hrang | Eng nge tih tur |
|---|---|
| 1. Inbuatsaihna | Eng tha takah chuan darthlalang hmaah inches 18 vel a hlaah ding rawh. |
| 2. Ke dahna hmun dah | Tape measure-a millimeter chhinchhiahna awmte chu darthlalang a hmuh theih turin her la, i mit hnuaiah leh i hnar chungah chelh rawh. Bang chungah i thlir kual ang maiin. |
| 3. Mit dinglam tehna | I mit veilam kha khar rawh. I mit dinglam chauh hmangin ruler-a zero (0) chhinchhiahna chu i mit dinglam circle dum lai takah chiah dah rawh. Heta tang hian ruler chu sawn suh. A awm a nih chuan bul tan leh rawh. |
| 4. Mit veilam tehna | Tunah chuan i mit veilam hawng la, i mit dinglam kha khar rawh. I mit veilam hmang chauhvin i mit veilam circle dum lai takah eng millimeter mark nge direct-a awm tih en rawh. |
| 5. A tehna lak | Millimeter value i hmuh chu i PD tehna a ni ang. |
Mi pakhat puihnaa i teh chuan...
Hei hi mahni chauha tih ai chuan a awlsam zawk. I tanpuitu hian hetiang hian a ti tur a ni.
| Step hrang hrang | Ṭanpuituin eng nge a tih ang |
|---|---|
| 1. Inbuatsaihna | I teh duh hmaah thu la, inches 18 vel a hlaah awm rawh. I hmai pahnih chu level khatah dah rawh. |
| 2. Ke dahna hmun dah | Ke chu midang mit hnuaiah leh an hnar chungah dah rawh. |
| 3. Mit dinglam tehna | Measurement latu chu i (i tanpuitu) mit veilam chu en nghal turin hrilh rawh . Mi dang mit dinglam ring dum pawn lam kil khatah chuan tehna tape-ah zero (0) dah rawh. Heta tang hian measuring tape chu sawn suh. |
| 4. Mit veilam tehna | Tunah chuan midang chu i mit dinglam chu en nghal turin hrilh rawh . Tunah chuan eng millimeter mark nge an mit veilam ring dum chhung lam kil nen a inmil tih en rawh. |
| 5. A tehna lak | Chu millimeter value i hmuh chu a PD tehna a ni. |
Engvangin nge he PD tehna hi a pawimawh em em?
I hria em, mit chhunga eng a luh hian thil kan hmu thin. He êng hi mitmeng (pupil) kaltlangin mit chhungah a lut thin. Tichuan chu êng chu lens kal tlangin retina-ah a innghat ta a ni.
Mahse mit i hmuh that loh chuan he light hian a focus tha lo. Chuvangin blurry kan hmu thin. Entir nan:
- Hmun hla tak atanga thlir theihna/Hyperopia
- Hmuh theihna/Myopia
- I upat deuh deuh chuan hnai taka hmuh harsa (Presbyopia) .
- Astigmatism tih hi a ni
Eyeglasses hi one-size-fits-all a ni lo. Thil tam tak a zirin an danglam a, chu chu i mit hmuhna lama harsatna leh i damdawi pek chakna te hi a ni.
He PD tehna hi a dik tur a ni a, chu chu glasses lens chakna chu i iris lairil takah a innghat dik theih nan. Chumi hnuah chauh chuan glasses atang hian hlawkna tam ber i hmu thei ang a, khawvel hi chiang takin i hmu thei ang.
PD tehna dik lo a nih chuan eng nge thleng ang tih han ngaihtuah teh...
I glasses hman te hi PD tehna dik lo atana siam a nih chuan i hre tan ngei ang.
- Mit tichhe thei
- Lu na
- Visual distortions (thilte chu a inzawm khawm ang maia hmuh) .
Heng symptoms te hi hlauhawm lo mahse, a nuam lo hle. Chu bâkah, i mit a tihbuai chhunzawm zel chuan i mit a tichhe thei tak zet a ni.
Puitling PD chu 63 mm vel a ni. Mahse, 50 atanga 70 mm inkar a ni thei. Mi tin a inang lo. I PD hi naupang i lo puitlin chuan a danglam thei a, mahse puitling i nih chuan a danglam lo tlangpui. Mahse, a tlem hle a, hmai emaw mit emaw operation hnuah pawh a danglam deuh thei.
Engtikah nge nangmah ngeiin i PD teh a rem loh?
I glasses hi thil pakhat atan (e.g., lehkha chhiar) i hmang tlangpui a nih chuan, mahni tehna neih chu thil lian tak a ni lo mai thei. Mahse, professional-level measurement i mamawh tak takna special case thenkhat a awm . Mahni tehna neih tum hi chutih lai chuan thil tha tak a ni lo.
| Huntha | Chhan |
|---|---|
| Multifocal lens i mamawh chuan | Chungte chu ``Progressive lens, bifocals, trifocals'' tia hriat a ni bawk. Heng lens te hian hmun engemaw zatah thiltihtheihna hrang hrang an nei a. Chuvangin PD tehna chu millimeter khat pawh off a nih chuan mit hmuhna chu a tichhe vek thei a ni. |
| Hmun hnai leh hla zawng zawng hmuh theih nan glasses vuah reng a ngai a nih chuan | Thil hnai tak kan en chuan kan PD hi millimeter 3 velin a tlahniam a. Hetiang glass design-naah hian he danglamna hi ngaihtuah a ngai a ni. Chumi atan chuan tehna dik tak a pawimawh hle. |
| I mit ah misalignment i neih chuan | Damdawi lamah chuan hei hi ``Strabismus'' an ti a, chutiang a nih chuan mit tin tan tehna hran siam a ngai a, glasses pawh dik takin siam a ngai bawk. |
Ram thenkhatah chuan dan an nei a, chu chuan PD tehna chu i mittui tlakna (eyeglass prescription)-ah telh a ngai a ni. Kan ramah hetiang dan hi awm lo mah se, i mit doctor emaw, mit lam doctor emaw hnenah i PD tehna tur i zawt thei reng a ni. I dikna a ni.
Take-Home Thuchah a ni
- Pupillary Distance (PD) chu i mit ring dum inkar hlat zawng a ni. He tehna hi i mittui tlakna tur dik tak i neih theih nan a pawimawh hle.
- PD tehna dik lo atana siam glasses vuah hian mit a ti na thei a, lu a na thei a, mit a ti fiah lo thei bawk.
- He tehna hi in lamah i la thei a, mahse a dik ber leh him ber chu professional-in a teh fo hi a ni.
- Professional measurement lak ngei ngei tur a ni , a bik takin multifocal lens i hman emaw, strabismus ang chi condition i neih chuan.
- I prescription-ah hian PD tehna a tel lo a nih chuan i doctor emaw optician emaw hnenah zawh hlau suh.
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