What is astigmatism? How does the "cyl" value relate to astigmatism correction?

By the time you have finished reading this, you should have a clearer idea of just what all the numbers and values mean. ... For instance, the SPHERE (SPH) and ... You need to know what these mean if you want to know how to understand your eye prescription. ... Axis: This explains where the irregular curve that is affecting ... The astigmatism contact lens package contains numbers along with letters such as AXIS and CYL. Do you know the meaning of these letters and numbers?This ... Mar 25, 2025 ... What Does Power Mean for Contacts? ... PWR means refractive power, but sometimes it can be abbreviated as SPH (sphere). This is the amount of ... Aug 2, 2024 ... It's likely that your contact lens prescription is different to ... What does CYL mean? Standing for cylinder, CYL explains the amount ... Aug 28, 2015 ... Overall, the prescription layout is pretty similar as there is the designation for left and right eyes (OS/OD), the prescription power (SPH, CYL ... What do the numbers on my prescription mean? Your prescription may include the following: SPH, CYL, Axis, ADD and Pupillary Distance (PD). Glasses Prescription ... PWR (Power)/SPH (Sphere): On a contact lens prescription, you may see the SPH ... What do the numbers on my eye prescription mean? Numbers on an eye ... Feb 21, 2004 ... Axis is part of your prescription, and tells an optometrist in which direction they must position any cylindrical power in your lenses that is ... They basically mean the same thing. The LARS/CAAS method is a way to determine the contact lens axis for next trial lens or final lens prescription, if a ...