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How Many Types of Spectacle Lenses
Types of optical lenses
Single Vision Lens
Bifocal Lens
Trifocal Lens
Progressive Lens
SINGLE VISION OR UNIFOCAL LENSES
- Single vision is the most common type of prescription lens. This lens type features a single field of vision or one prescription power throughout the entire lens.
- Prescribed only for a single vision for correcting:-
- Nearsightedness (myopia) – Distance vision glass
- Farsightedness (hyperopia) – Near vision glass
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Bifocal Lens
- Bifocal lenses combine vision correction for near-sightedness and far-sightedness.
- The top of the lens is for distance viewing and the bottom half is for the close-up.
- These are often prescribed for people whose near-vision has declined due to age.
- There are several types of bifocal.
Tirfocal Lens
- Trifocals are eyeglasses with lenses that have three regions that correct for distance, intermediate (arm’s length), and near vision.
- John Isaac Hawkins developed the trifocal lens in 1827.
- Trifocals are mostly used by people with advanced presbyopia who have been prescribed 2 diopters or more of reading addition.
Progressive Lenses
- Progressive lenses are line-free multi-focal that have a seamless progression of added magnifying power for intermediate and near vision.
- The junction between these distinctly different power zones is defined by a visible “bifocal line” that cuts across the center of the lens.
