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• glider3560
• 12th Mar 17, 1:30 PM
• 3,163Posts
• 1,920Thanks
glider3560
Before I query with the optician this week, can anyone tell me if they also think this is a bit odd.

I have astigmatism and have an axis measurement on my prescription.

2014:
Left 180.0
Right 180.0

2017:
Left 175.0
Right 5.0

It seems odd that the shape of my right eye would have changed over a three year period! Does anyone else think this is also a typo on the right eye?

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• boliston
• By boliston 12th Mar 17, 1:59 PM
• 2,185 Posts
• 1,749 Thanks
boliston
5 degrees is the smallest change i think (a minute on a clock face is 6 degrees)
• theoretica
• 12th Mar 17, 4:32 PM
• 4,724 Posts
• 5,956 Thanks
theoretica
You seem to be thinking that 5 degrees is a whole 175 degrees away from 180 - but it isn't - it is only 5 degrees away, because 180 = 0. The axis goes all the way through the centre point and out the other side.
But a banker, engaged at enormous expense,
Had the whole of their cash in his care.
Lewis Carroll
• frugalmacdugal
• 12th Mar 17, 4:39 PM
• 5,816 Posts
• 5,026 Thanks
frugalmacdugal
Hi,

Axis. This describes the lens meridian that contains no cylinder power to correct astigmatism. The axis is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian.

Y'all take care now.
• glider3560
• 12th Mar 17, 5:34 PM
• 3,163 Posts
• 1,920 Thanks
glider3560
Thanks everyone. That's put my mind at rest!

The optician seemed very rushed, so making a typo could have easily been a possibility. But clearly, that's not the casw.

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