Ib tug neeg pom txog li 70% ntawm tag nrho cov ntaub ntawv los ntawm lub cev ntawm lub zeem muag. Qhov no yog vim li cas qhov muag kev noj qab haus huv yuav tsum tsis txhob muab pov tseg. Peb tsis txuas ntau qhov tseem ceeb rau ntau yam tsis xws luag, vim lawv tsuas yog ua rau qhov tsis zoo ntawm lub zeem muag, thiab tsis ua rau nws poob. Ib qho kab mob zoo li no yog astigmatism.
Astigmatism yog qhov tsis pom kev tsis pom kev uasNyeem ntxiv ...