Astigmatism Prescription Explained | Frame & Focus Eye Care
What do CYL and Axis mean on an astigmatism prescription? CYL (Cylinder) measures the degree of astigmatism in your eye — how much your cornea curves unevenly. Axis is the angle (1–180°) that tells your optometrist the exact direction of that curve. Together, these two numbers ensure your lenses correct […]
