What Does Sph Mean In Eyeglasses
What Does Sph Mean In Eyeglasses
Understanding the intricacies of eyeglasses can be a daunting task, especially when confronted with unfamiliar acronyms and abbreviations. One such term that often arises is "SPH," an abbreviation that plays a crucial role in determining the corrective power of lenses. In this article, we delve into the significance of SPH in eyeglasses, exploring its meaning, implications, and how it contributes to achieving optimal vision correction.
What Does Sph Mean In Eyeglasses?
Have you ever wondered what the "SPH" stands for in your eyeglasses prescription? It's an abbreviation for "sphere," and it refers to the amount of spherical correction that is needed to correct your vision. Spherical correction is used to correct nearsightedness (myopia) and farsightedness (hyperopia). If you are nearsighted, you have difficulty seeing things that are far away, and your SPH value will be a negative number. If you are farsighted, you have difficulty seeing things that are close up, and your SPH value will be a positive number. The higher the SPH value, the stronger the correction that is needed.
How Is SPH Measured?
SPH is measured in diopters (D). A diopter is a unit of measurement that describes the power of a lens. The higher the diopter value, the stronger the lens. For example, a -2.00 D lens is stronger than a -1.00 D lens. SPH measurements can range from -20.00 D to +20.00 D. Most people have SPH values between -5.00 D and +5.00 D.
What If I Have Astigmatism?
Astigmatism is a condition in which the cornea or lens of the eye is not perfectly round. This can cause blurred vision at all distances. If you have astigmatism, you will need to wear glasses or contact lenses that have a cylindrical correction in addition to a spherical correction. The cylindrical correction is used to correct the astigmatism. The amount of cylindrical correction that is needed is measured in diopters (D), just like the SPH value. Cylindrical correction values can range from -2.00 D to +2.00 D.
