What do [CY] and [AX] in contact lenses mean?
Both [CY] and [AX] numbers are needed when you order toric contact lenses for astigmatism.
The terms [CY] and [CYL](Cylinder) represent astigmatism power.
Astigmatism power is represented with a minus sign (-), such as -0.75, -1,25, -1,75 and 2,25, and the higher the numerical value, the stronger the corrective power required.
The terms [AX] and [AXIS] represent a numerical value, between 0 and 180, indicating the degree or orientation of astigmatism, specifically the direction of corneal distortion.
