Cylinder in Prescription Glasses: The Key to Effective Astigmatism Correction
Understanding your glasses prescription can be quite confusing, but an optometrist can help explain it to you in detail. Here are some key components of a glasses prescription that an optometrist may explain to you: 1. Sphere (SPH) – This number indicates the amount of lens power prescribed for myopia (nearsightedness) or hyperopia (farsightedness). A negative number indicates myopia, while a positive number indicates hyperopia. 2. Cylinder (CYL) – This number represents the amount of lens power for astigmatism. It may be preceded by a minus or plus sign, and…
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