Single vision prescription lenses contain the same amount of vision correction over the entire lens. These lenses can correct nearsightedness, farsightedness, and astigmatism. Single vision lenses can come in a couple varieties. In terms of reading glasses, full frame reading glasses are your standard readers. Being wider, they provide a larger line of up-close vision.
Many progressive lenses that are on the market today use lens designs that are 10 or 15 years old. We use lenses that are constantly updated with the latest technology. If you had a top-of-the-line television from 15 years ago and compared it to even the most basic of televisions available today, there would be no comparison in which on ewould give you a better picture.
With progressive lenses, you can combine different lens strengths into one lens for seamless and precise vision from near to far, without changing glasses. Progressive lenses are the most comfortable solution for problems such as presbyopia because they can be individually tailored to your eyes, resulting in clear sight in all fields of vision.
Your advantages at a glance
Digitally Enhanced Progressive Lenses
Computer Lenses are an occupational progressive lens, a no-line multifocal that corrects near, intermediate and, to a degree, distance vision. It has a larger intermediate zone than regular progressive lenses, leaving less space for distance. Computer lenses are generally not suitable for driving or regular wear.
While bifocals work great for tasks like driving and reading, they are limited in their ability to provide clear vision at points in between, such as the distance to a computer monitor.
As their name suggests, bifocal eyeglass lenses have two lens powers — one for distance and one for near.
The lower half of a bifocal lens contains the near segment for reading and other close-up tasks. The rest of the lens is usually a distance correction, but sometimes has no correction at all in it, if you have good distance vision.
The Franklin bifocal design remained in style for more than a century. Then in the early 1900s, the invention of fused bifocals offered thinner and more attractive lenses.
In a fused bifocal, a small lens segment for near vision is attached (fused) to a full distance lens.
The most popular fused bifocal today has a D-shaped near segment rotated 90 degrees so that the flat part of the "D" is facing up. For this reason, D-seg bifocals also are called "flat-top" (FT) or "straight-top" (ST) bifocals.
Flat-top bifocals are further described by the width of the near segment, measured in millimeters (mm). The most popular FT bifocal is the FT-28, a flat-top bifocal with a near seg that is 28 mm wide.
Another popular fused bifocal is the round seg bifocal. An advantage of round seg bifocals is that the line separating the distance and near zones of the lens tends to be less noticeable than the upper line of a D-seg bifocal.
Some people are reluctant to try trifocals because they are concerned about the appearance of the lenses or are worried that trifocals will be difficult to get used to, since the top line of the intermediate zone is close to the center of the lens. But in fact, most people who try them are very pleased with the added range of vision trifocals provide (compared with bifocals) and the wide field of view they offer for computer use.
Trifocal eyeglass lenses have an additional ribbon-shaped lens segment immediately above the near seg for seeing objects in the intermediate zone of vision — approximately 18 to 24 inches away.
This intermediate segment provides 50 percent of the added magnifying power of the near seg, making it perfect for computer use and for seeing your speedometer and other dashboard gauges when driving.
Trifocals are especially helpful for presbyopes over age 50, who have less depth of focus than younger presbyopes, who may still be able to see objects at arm's length reasonably well through the top part of their bifocals.
As with bifocals, the most popular trifocals have a flat-top (FT) design, with the near and intermediate segments being 28 mm wide.
Would you like personalized advice?
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