Eye glasses power
The power of eyeglasses, also known as the prescription, is measured in diopters (D) and indicates the strength of the lens needed to correct a person’s vision. The power of the lens is determined by the refractive error of the eye, which is the degree to which the eye’s shape and length affect how light is focused on the retina.
The two most common refractive errors are myopia (nearsightedness) and hyperopia (farsightedness). Myopia occurs when the eyeball is too long or the cornea is too steep, causing light to focus in front of the retina. Hyperopia occurs when the eyeball is too short or the cornea is too flat, causing light to focus behind the retina.
The power of a corrective lens for myopia is expressed as a negative number, such as -1.50 D, while the power of a corrective lens for hyperopia is expressed as a positive number, such as +2.00 D. The higher the number, the stronger the lens needed to correct the vision.
Prescription lenses may also include a cylindrical component to correct astigmatism, which is a condition where the cornea is shaped more like a football than a basketball, causing blurred vision at all distances.
It is important to get an eye exam from an eye doctor to determine the correct prescription for your eyeglasses, as wearing the wrong prescription can cause eye strain, headaches, and other discomforts.
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