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Easily convert between plus and minus cylinder prescriptions with this optometry focused calculator for clinical use.

Apr 18, 2023 · What is the “cylinder (CYL)” number on my prescription? The cylinder number is how much astigmatism you have, if any. This is when part of the cornea has a different curve. …

Oct 28, 2025 · Learn how to read your glasses prescription with this easy guide. Understand eye prescription terms like SPH, CYL and Axis to know your vision needs.

Oct 9, 2024 · Cylinder, abbreviated CYL and diopters in measurement, indicates the lens power you need for astigmatism correction. Astigmatism is an uneven curvature of the eye’s cornea …

Aug 5, 2025 · Wondering if CYL on your eye prescription means you have astigmatism? This quick guide breaks down what CYL means, why it matters, and what to do next.

When it comes to prescriptions, the cylinder (CYL) and axis values are particularly confusing for many people, especially when ordering contact lenses online. Understanding these values …

Jun 21, 2025 · CYL stands for "Cylinder," and it is a measurement used in eye prescriptions to correct irregularities in the shape of your cornea or lens. Unlike the SPH, which measures your …

Oct 31, 2025 · “Cyl.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cyl. Accessed 31 Oct. 2025.

The "Cylinder" (or "Cyl") describes how much lens power is needed to correct astigmatism. This is when your lens or cornea is not evenly shaped, which can make your vision blurry or distorted.