I’ve been recording my centimetre measurements for about 6 weeks now and I always found the left eye (with a worse astigmatism) harder to measure for blur. I sometimes found it hard to judge and would get very different readings which were worse than my right eye, even though from a diopter perspective it was .25 less than my right.
I’ve since tried measuring my astigmatism using jake’s ingenious tool. WOW! I could really see the astigmatism like never before as the arrow and dial markings would be straight and dark more or less exactly on the Axis as on my prescription (I really hate that definition now) from my optometrist.
However it led me to realise that my astigmatism could be what’s causing the inconsistency in my centimetres for my left eye. I was using a home made centimetre measuring tape and printed cars with text to assess my distance for blur but I think I’m getting better results using the astigmatism dial - if I have the arrow located on the correct axis for that eye of course.
I’m just wondering if anyone else with astigmatism has found that this is a better way for them to measure their centimetres and if my hypothesis is indeed correct!
For reference my astigmatism is :
Right eye - axis 165 Cyl -.0.75
Left eye - axis 120 Cyl -1.00