Progressive lenses, or no-line bifocals, are lenses that are used in correcting presbyopia. Instead of bifocal lenses, these lenses are used in eyeglasses for smoother and continuous vision without lines that create image jump. Over the years several improvements were made on progressive lenses that today they are the best option for people with presbyopia.
Progressive Lenses: Improvements over the years
Progressive lenses or progressive addition lenses (PAL) first became commercially available during the 50s and 60s. At that time, manufacturing the lenses was quite difficult. A semi-finished lens with standard is needed while the prescription is imparted at the back surface. The difficult part is the mathematics or the geometry in imparting the prescription at the back surface. Computations for the curvature were done manually since there were no computers yet during that time. Over the years there were several improvements in the computation and imparting of the prescription. However, the problem with the distortion in the lower part of the lens remains. It was a serious problem for a lot of people since it causes nausea especially if the prescription is higher.
With the advent of digital processing, it became possible to create free-form lenses. These lenses have less distortion. Using a computer numerically controlled generator, it became possible to carve the surface more accurately regardless of how multifarious it is.
Why progressive is better than bifocal
Progressive lenses, compared with bifocal, have become the preferred choice for many users. This is because they offer more benefits than the bifocals. Here are the benefits of using progressive lenses:
- Greater resolution so everything is clearer
- Less distorted vision
- The transition from distances is smooth
- No image jump
- Easier to get used to
There are many advantages to using progressive eyeglasses. Unlike the bifocals, it allows the wearer to see from distance to near vision without the image jump of bifocals and transition is smooth. There is also no visible line that divides the lenses so it is more natural and aesthetically and cosmetically pleasing.
What are the different types of progressive lenses?
There are different types of progressive lenses, such as lenses with a wider field of vision. One good thing about progressive lenses today is that they are custom fit for better vision and correction. The lenses are created to fit the specific needs of the individual. This is the reason why it is important to go to a good Houston eye center. All the improvements and benefits of progressive lenses is only possible if they eye center uses the latest in eye correction technology and the latest progressive lenses in the market today.
For example, if you go to Houston LASIK & Eye, a LASIK or laser eye surgery center, the eye doctor will take everything into consideration, including your work and lifestyle. If you do a lot of reading, for example, you may need a wider field of vision. They will then prescribe to you the right type of progressive lenses that fit your exact needs.
Houston LASIK & Eye leads in providing premium LASIK technologies to Houston, Sugar Land, and the surrounding region. The Center’s award-winning medical director introduced revolutionary technologies such as iLASIK to the region. This technology is used by NASA astronauts, Navy SEALS, and Air Force fighter pilots. At Houston LASIK & Eye, you can now receive the same treatment. For more information, please call (281) 240-0478..