Yog vim li cas cov menyuam kawm ntawv yog dilated: Ua thiab yuav tshwm

Kawm ntawv - ib tug yeej qhov nyob rau hauv lub iris ntawm lub qhov muag, ib yam ntawm cov diaphragm uas yuav hloov nws txoj kab uas hla. Sensitive photoreceptors ntawm lub qhov muag nrog zoo kawg raug teb rau cov kev hloov nyob rau hauv khiav ntawm lub teeb rays. Nyob rau ntawm lub teeb kev siv ntawm ib tug tshwj xeeb cov nqaij thiaj li los yog tsub kom qhov luaj li cas ntawm lub qhov, li no kho tus nqi ntawm lub teeb tsoo lub puab plhaub - retina. Hloov lub lub cheeb ntawm tus menyuam kawm ntawv - ib tug ntawm cov tseem ceeb tshaj plaws kev ntsuas ntawm lub zog thiab lub xeev ntawm lub paj hlwb. Tsis rau ib yam dab tsi, nyob rau hauv tej feature zaj duab xis nplooj siab mus rau thaum muaj xwm ceev cov tshuaj, koj yuav saib tau npaum li cas nqaim tus kws kho mob ci ib lub teeb khoo rau hauv tus neeg mob lub qhov muag nyob rau hauv thiaj li yuav ua rau ib tug reflex contraction ntawm tus menyuam kawm ntawv thiab rau kev ntsuam xyuas cov theem nco qab.

Hloov qhov luaj li cas ntawm cov menyuam kawm ntawv tej zaum yuav yog vim tsis tau tsuas yog rau cov neeg kawm ntawv ntawm illumination. Piv txwv li, thaum ib tug neeg pom ib yam dab tsi uas ua rau lub nce txaus siab, tus menyuam kawm ntawv loj hloov sai heev.

Yog hais tias cov tub kawm ntawv yog dilated, yog vim li cas rau qhov no tej zaum yuav: ib tug muaj zog tig tau, arousal, xim, kev mob, kev ntshai. Tab sis muaj mob qhov expansion, uas nws thiaj li ua rau yus lub yeej ntawm lub optic qab haus huv.

Cov tub kawm ntawv thiab cov kab mob

Pheej dilation ntawm cov tub kawm ntawv, cov kws kho mob hu ua mydriasis. Qhov no mob yuav tshwm sim los ntawm lub hwj chim tshuaj los yog tshuaj (xws li cov tshuaj).

Txawm li cas los, cov kws kho mob hais tias yog hais tias tus tub kawm ntawv tau yog dilated, yog vim li cas yuav tsum tau sau tseg sai li sai tau. Mydriasis yuav ua rau raug mob (ob lub qhov muag thiab lub hlwb), raws li zoo raws li stroke, qaug dab peg thiab ob peb lwm yam hlwb kab mob. Txawm li cas los, nyob rau txawv hnub nyoog ua pheej hloov nyob rau hauv tus menyuam kawm ntawv loj yog cov sib txawv. Yog hais tias cov neeg laus tub ntxhais kawm muaj dilated, cov ua ntawm no phenomenon yuav ua tau vim txhab thiab cov kab mob ntawm lub hlwb hlab ntsha.

Tab sis yog hais tias nws tshwm sim nyob rau hauv cov me nyuam mos thiab cov me nyuam yaus tsis tau yeej ib txwm txhawj. Yog hais tias lub cai dilated tub kawm ntawv ntawm tus me nyuam, yog vim li cas rau qhov no tshwm sim yuav ua tau vim tsis tseem ceeb caj yam ntxwv. Nws yog noteworthy tias nyob rau hauv cov me nyuam mos thiab cov tub kawm yog tag nrho cov sib txawv ntau thiab tsawg. Nyob rau hauv feem ntau tus neeg mob, tsis txhob txhawj. Tab sis yog hais tias tus menyuam kawm ntawv yog txhab los ntawm ntau tshaj 1 hli, thiab nyob rau hauv tus ntawm lub teeb mus rau tus thawj loj yog tsis tau rov qab, nws yog lub sij hawm mus ntsib ib tug kws kho mob.

Mydriasis ib tug tub hluas - ib tug kos npe rau ntawm teeb meem

Raws li hais saum toj no, qhov kev hloov nyob rau hauv tus menyuam kawm ntawv loj thiab tsim cov tshuaj - yeeb, LSD, tshuaj maj, amphetamines thiab lwm yam cov tshuaj. Yog hais tias dilated cov menyuam kawm ntawv nyob rau tus tub hluas, yog vim li cas rau qhov no yog feem ntau ncaj ncees. Pheej hloov nyob rau hauv tus menyuam kawm ntawv loj upwards yog ntshai raws li ib tug muaj sia kos npe rau ntawm siv yeeb tshuaj. Txawm li cas los, cov niam txiv thiab cov xib fwb yuav tsum paub hais tias qhov rov qab tshwm sim (pab contraction ntawm tus menyuam kawm ntawv) - kuj yog ib tug paub tseeb kos npe rau ntawm intoxication ntawm opiate tshuaj pab pawg neeg. Nyob rau hauv cov ntaub ntawv no, cov menyuam yog unusually nqaim thiab tsis nthuav, txawm nyob rau hauv tag nrho qhov tsaus ntuj. Tab sis cov menyuam kawm ntawv thiab cov hluas yuav tsum txhab thiab vim hais tias ntawm tus kab mob. Peb yuav tsum tsis txhob hnov qab txog qhov tseeb hais tias mydriasis tso cai nyaj ib tug kab mob ntawm poob siab system los yog cov ntshav hlab ntsha. Nyob rau hauv tas li ntawd, cov tub kawm ntawv ntawm txawv ntau thiab tsawg - qhov no yog ib thaum ntxov kos npe rau ntawm lub hlwb mob los yog mob loj heev mob.

Yog hais tias koj pom tias koj los yog koj tsev neeg 'tub ntxhais kawm muaj dilated, yog vim li cas yuav tsum tau sau tseg sai li sai tau. Dav cov menyuam kawm ntawv muab lub qhov muag zoo nkauj, tab sis lawv kuj muaj peev xwm co tes kev nyuaj siab thiab tus kab mob.