Lens types are defined by the number of focus areas they provide, and the way they are designed, which correspond to different visual strengths or correction zones. A lens can have anywhere from none to three distinct areas of focus:
Single Vision
Single - Standard or Most Common
Single vision lenses, also known as monofocal lenses, have one consistent prescription throughout the entire lens. They are designed to correct a single field of vision, either for distance, intermediate, or near tasks such as reading. These are the most common type of prescription lenses.
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Progressives
Multifocal - No-Line
Progressive lenses, also known as no-line bifocals, multifocal lenses, or varifocal lenses, provide seamless vision correction for distance, intermediate, and near vision. Unlike traditional bifocals or trifocals, they feature no visible lines, allowing for a smooth and natural transition between focus zones.
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Bifocal
Double - Lined Flat-Top
Traditional lined bifocal lenses feature two distinct focal areas: one for distance vision and one for near (reading) vision. Most of the lens is dedicated to distance, while a smaller, semicircular segment near the bottom provides magnification for close-up tasks. The reading segment—known as the bifocal area—comes in various shapes and sizes. One of the most common designs is the Flattop 28 (FT-28), named for its flat upper edge and 28mm width.
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Trifocal
Multifocal - Lined Flat-Top
Lined trifocal lenses are made similarly to lined bifocals, but also have a smaller third area of lens strength for the intermediate reading area above the near area. Trifocal lenses function similarly to their discrete option, progressives, by offering a multifocal solution with three focal areas.
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Plano
Non-Prescription
Plano lenses—also known as non-prescription lenses—have no vision correction power. They are often used for fashion eyewear, protective glasses, or blue light filtering, providing the look or function of glasses without altering vision.
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