Single vision glasses are designed to help people who require correction of farsightedness, nearsightedness, or astigmatism. These prescription eye glasses have just a single optical prescription correction, and they distribute focus evenly over the entire surface area of the lens. Most people who wear prescription eye glasses usually get this type. If you have multiple prescriptions, you would require bifocal or multifocal eye glasses.

Progressive lenses provide a smooth transition from distance correction to near correction, eliminating segment lines and allowing clear vision at all distances, including intermediate, near and far. Progressive lenses are also known as no-line bifocal lenses.

With these specialty lenses, the prescription at the top of the lens is different from that at the bottom of the lens. It differs from a bi-focal as there is a gradual shift in the prescription instead of a blunt line made in the lens.

The very top part of the lens works well for distance. The bottom portion gets progressively stronger ending with the strongest portion at the very bottom for reading. A progressive lens allows the wearer to view all ranges of vision from near to far. Additionally, the lenses look identical to single-vision lenses, with no lines, allowing others to only see your eyes!

The primary purpose of glasses bifocals is to provide the optimal balance between distance vision and near vision focusing needs. Eye glasses with bifocal lenses are available with the reading segments in a variety of shapes and widths including bifocal sunglass options.

Trifocal lenses are similar to bifocals, except that the two focal areas are separated by a third middle area with intermediate focus correction. This area is used for intermediate vision; roughly at arm’s length (i.e. computer distance.) This lens type has two segment lines, dividing the three different correcting segments.