What does CYL mean for glasses?
What does CYL mean for glasses?
Cylinder (CYL) – This indicates the amount of lens power for astigmatism and represents the difference in the greatest and weakest powers of the eye, usually separated by 90 degrees.
Cylinder (CYL) – This indicates the amount of lens power for astigmatism and represents the difference in the greatest and weakest powers of the eye, usually separated by 90 degrees.
