What Type of Lens Is Used to Correct Nearsightedness?
Nearsightedness — the condition where a person can see near objects clearly but distant vision is blurred — typically is easily corrected with prescription eyeglasses or contact lenses.
Lenses used to correct nearsightedness are concave in shape. In other words, they are thinnest at the center and thicker at the edge.
These lenses are called “minus power lenses” (or “minus lenses”) because they reduce the focusing power of the eye. By doing so, minus lenses move the focus of light in a nearsighted eye from a point in front of the retina backward so it falls directly onto the surface of the retina. This shift corrects the blurry distance vision caused by myopia, restoring clear vision.
The power of lenses that correct nearsightedness is measured in diopters (D) and this power number always begins with a minus sign. The higher the dioptric power of the lens, the more myopia it corrects.
For example, a -6.00 D lens corrects twice the amount of nearsightedness as a -3.00 D lens.
High-index lenses typically are recommended for correcting nearsightedness greater than -3.00 diopters. These lenses are thinner and lighter than standard plastic lenses, making them more attractive and comfortable.
Also, anti-reflective coating is highly recommended for lenses that correct nearsightedness. AR coating eliminates distracting reflections in the lenses, making them appear thinner and more attractive. Eliminating reflections also improves vision and comfort.
Ortho-k contact lenses are another choice for the correction of nearsightedness. These are specially designed rigid gas permeable (GP) contact lenses that not only correct existing myopia — they may actually help control myopia progression in children.
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