Single vision lenses have only one prescription for farsightedness, nearsightedness, or astigmatism. Most prescription glasses and reading glasses have single vision lenses. Some people are able to use their single vision glasses for both far and near, depending on their type of prescription. Single vision lenses for farsighted people are thicker at the center. Single vision lenses for wearers with nearsightedness are thicker at the edges. Single vision lenses generally range between 3-4mm in thickness. The thickness varies depending on the size of the frame and lens material chosen. Tags:1.74 lens,1.74 single vision lens
1.How High-Index Lenses Differ From Regular Lenses? As the index of refraction increases, the curvature needed to produce a specific correction decreases. The result is a flatter, more attractive, lower volume, thinner lens than was previously possible. Higher index materials have given patients, especially those with large refractive errors, freedom to choose lens sizes and shapes, as well as frame styles, that were once unavailable to them. When these high index lens materials are used in aspheric, atoric, or progressive designs and paired with premium lens treatments, the value to you, the patient, expands dramatically.
