yksiteholinssejä

Yksiteholinssejä, also known as single vision lenses, are a type of eyeglass lens designed to correct vision at a single, fixed distance. Unlike multifocal lenses which offer correction for multiple distances, single vision lenses provide a uniform prescription across the entire lens surface. This makes them ideal for individuals who primarily experience vision problems at one specific range, such as nearsightedness (myopia), farsightedness (hyperopia), or astigmatism.

The manufacturing process for yksiteholinssejä involves precisely grinding the lens material to create the desired refractive power. This power is determined by an optometrist or ophthalmologist through an eye examination. For myopia, the lens is typically concave, diverging light rays to focus them correctly on the retina. For hyperopia, the lens is convex, converging light rays. Astigmatism correction involves creating a cylindrical shape in the lens to compensate for irregular curvature of the cornea or lens.

Yksiteholinssejä are commonly prescribed for a wide range of ages, from children to seniors. Their simplicity and effectiveness in correcting a single refractive error make them a popular and cost-effective choice. They are suitable for various activities, including reading, driving, or computer work, as long as the user's vision needs are met by a single focal point. When vision needs change and require correction for multiple distances, other lens types like bifocals or progressives are typically recommended.