Here's a guide to help you understand different types of lenses commonly used in eyewear

Single Vision Lenses

Single vision lenses have a consistent prescription power throughout the entire lens. They correct fora single vision condition, such as nearsightedness (myopia) or farsightedness (hyperopia). These lenses are also used forreading glasses or for individuals who need correction for only one distance.

Bifocal Lenses

Bifocal lenses have two distinct areas of prescription power in a single lens. The upper portion is typicallyused for distance vision, while the lower portion contains a reading segment for near vision. Bifocals are suitable forindividuals who need correction for both distance and near vision.

Progressive (Multifocal) Lenses

Progressive lenses, also known as multifocal lenses, offer a seamless progression ofprescription powers from top to bottom. They provide correction for distance vision at the top of the lens, intermediatevision in the middle, and near vision at the bottom. Unlike bifocals or trifocals, progressive lensesdo nothave distinctlines separating the different prescription zones. They offer a more natural transition between focal distances and a more aesthetically pleasing appearance.

Photochromic Lenses

Photochromic lenses, also known as transition lenses, are lenses that darken in response to UV lightand become clear indoors or at night. They provide the convenience of both clear lenses and sunglasses in one, adaptingto different lighting conditions.

Polarized Lenses

Polarized lenses have a special filter that reduces glare caused by light reflecting off flat surfaces such aswater, snow,