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What does axis mean on my prescription? Answer: The axis number on your prescription tells your optician in which direction they must position any cylindrical power in your lenses (required for people with astigmatism). This number shows the orientation or angle in degrees from 1 to 180. The number 90 means vertical position and 180 horizontal. A higher number for the axis does not mean that your prescription is stronger - it simply describes the position of the astigmatism. Prescription Was this answer helpful?
A spherical lens is the same in all directions; you can turn it around, and it doesn't change the way it magnifies, or the way it blurs: A cylindrical lens has refractive power in one direction, like a bar reading magnifier. The rotational orientation of that power is indicated in a prescription with an axis notation. The axis in a prescription describes the orientation of the axis of the cylindrical lens.