Cylindrical glassesfor astigmatism

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When selecting eyewear to correct astigmatism, understanding the roles of cylinder and axis is crucial. These two parts of your prescription work in tandem to provide a tailored solution to your specific visual needs. At Zenni Optical, we simplify the process of selecting the perfect lenses, ensuring you can navigate the options with ease and confidence. Here are some tips:

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Understanding astigmatism and its correction is essential for those who wish to see the world with clarity. Astigmatism, often misunderstood, is a common refractive error, not a disease or health condition. It occurs when the eye does not focus light evenly onto the retina because of an irregularly shaped cornea or, in some cases, the curvature of the lens inside the eye.

The axis is an equally important component in an astigmatism prescription. Measured in degrees, the axis denotes the orientation of the astigmatism, specifically where the difference in curvature is occurring in the eye. An axis number between 0 and 180 precisely locates the area that requires corrective power. Without a properly defined axis, the cylinder correction would not align correctly, leaving the astigmatism unaddressed. The axis helps in the following ways:

Dr. Steven Liem, O.D., F.A.A.O. is an optometrist based in Pasadena, California. After obtaining his doctorate from UC Berkeley’s School of Optometry, he completed his residency in Pediatrics, Vision Therapy & Rehabilitation and became a Fellow of the American Academy of Optometry. When he isn’t busy streaming or making Youtube videos about video games, Dr. Liem aims to broaden accessibility to vision health through his involvement in optometric industry and tech.

The term cylinder in an eyeglass prescription speaks directly to astigmatism. It refers to the lens power needed to correct the irregular shape causing the astigmatism. The cylinder value is measured in diopters and indicates the amount of lens power for astigmatism correction. A cylinder value may appear as a negative or a positive number on your prescription, denoting the type of astigmatism – myopic or hyperopic, respectively. Here’s how the cylinder plays a role in vision correction: