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Glasses cylinder
By Isabella Sara Novack
Reviewed by
Maria Horan FBDO
Reviewed by
Maria Horan FBDOMaria holds a BSc Honours in Ophthalmic Dispensing and has over 17 years of optical experience.
Updated On Mar 18, 2025
The cylinder (CYL) value indicates the amount of lens power needed to correct the uneven curvature of the cornea. The CYL power can be written in + or - Cyl. The CYL power will always have an axis direction. This value is combined with the axis to properly align the corrective power in the lenses, ensuring sharper vision.
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