Guide:Reading glasses prescriptions
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How do you read these complicated things!? Believe it or not, they're actually pretty simple to understand.
Spherical
Spherical is your overall myopia, in all directions.
Cylinder
Cylinder is myopia in a specific direction of your eye. Think of a straight line going across the surface of your eye at a certain degree. The degree this happens at is your axis.
Axis
Axis is the degree at which cylinder values are relevant. The right cylinder value but the wrong axis value would make the correction pretty worthless! When reducing your correction, you should never ever change the axis, especially if you've had that value of axis for a long time.
If you don't have any cylinder correction, you will not have an axis value either.