1A vision condition (astigmatism) where the cornea or lens is irregularly shaped so light does not focus properly on the retina, causing blurred vision.
乱視のため、彼は遠くの文字が二重に見えることがある。
Because of astigmatism, he sometimes sees distant letters doubled.
視力検査で乱視が見つかったので、眼鏡を作ることにした。
Astigmatism was found in the eye exam, so I decided to get glasses made.