What are Freeform Varifocal Lenses?
Corrective lenses all work towards improving the clarity of your eyesight by compensating for any defect or compromise in the structure or functioning of your eyes. There are many types of lenses that are built to compensate for specific problems related to your eyesight.
The improvement in technology has allowed us to create more effective and functional lenses to treat problems like presbyopia, astigmatism, hyperopia and myopia. Varifocal lenses are one of the more recent types of lenses to be constructed, giving users many advantages over conventional lenses.
Varifocal Lenses and Their Uses
Varifocal lenses, or progressive lenses, are used by people who have two prescriptions, allowing them to see clearly for different viewing distances. For instance, when a person ages, the ability to clearly focus on nearby and distant objects diminishes. Instead of using a bifocal or trifocal lens which incorporates segments on the surface, a progressive lens can offer seamless continuation of vision. These lenses are also cosmetically advantageous due to the lack of visible segments.
The seamless change in lens power requires people to resort to only small adjustments to head position when they need to view objects which lie at different distances. Varifocal lenses are also called progressive lenses due to the way the power of the lens increases between the region of low-power and region of high-power on the lens.
Freeform Varifocal Lenses
Freeform varifocal lenses are the most advanced versions of progressive lenses. They are created by computer-driven equipment and are made to suit each individual specification.
These lenses are called “back-surface lenses” because of the technology used to create them. Back-surface technique allows us to create lenses with much more sophistication, making it possible to optimize the vision of a person according to his or her individual prescription.
Using free-form varifocal lenses comes with many benefits including clearer vision, improved field of viewing area and minimised distortion in the peripherals or edges. As the distortion is reduced and the field of vision is improved, people take lesser time to get used to a new set of free-form varifocal lenses.
Also, the high degree of customization which can be done using back-surface lenses makes it possible to use such lenses regardless of the frame selection and the prescription. If you believe that you need to use free-form varifocal lenses, make sure that you get your eyes tested from a reliable optician.