astigmatism is a nasty beast. Looking back at my prescriptions my astigmatism can jump all over the place, even within 4 months period. I had a holiday in Japan

astigmatism is a nasty beast. Looking back at my prescriptions my astigmatism can jump all over the place, even within 4 months period. I had a holiday in Japan once, and they make you a pair of glasses within an hour, so I got some as a backup despite I've only just got a new pair recently and the astigmatism axis was a complete flip...