Lenses worn in front of the eyes to compensate for refraction errors. The name comes from the fact that glass was originally used for corrective lenses. Today most glasses have plastic or polycarbonate lenses because these types of lenses are lighter in weight and shatter-resistant. Some lenses use materials that are denser than the usual optical plastics and allow lenses with very strong corrections to be thinner, lighter in weight, and more cosmetically appealing. Coatings added to lenses provide ultraviolet light protection, provide scratch resistance, and reduce reflection and glare.
A transparent refractive device worn to correct refraction errors in the patient’s eyes.
These are instruments worn over the eyes that include lenses designed to rectify vision issues, thereby enabling clear sight.
Lenses, crafted from either glass or plastic, have their shape and thickness determined during an eye exam. Convex lenses, which bulge outward, are used for hypermetropia, also known as farsightedness, while concave lenses, which curve inward, are used for myopia, also known as nearsightedness. The majority of lenses are single-vision, but there’s a growing trend for bifocal, trifocal, and varifocal lenses. Lenses can also be tinted to shield the eyes from sun exposure.