What are varifocal lenses?
Varifocal lenses, also known as progressive lenses, are designed to counter presbyopia, which usually begins to affect us in our forties. As our eyes mature, the nearest point of vision that we can focus on becomes further away and so reading and other near vision activities become more difficult.
Varifocal lenses have a gradual change in strength from the top of the lens to the bottom allowing you to see all distances through just one lens. This means you do not need to switch between glasses for different vision needs.
Unlike bifocals, they do not contain a reading segment or dividing line within the lens so they can be used for a wider range of tasks and makes them more cosmetically pleasing.
How do varifocals work?
Simply put, a varifocal lens will have differing strengths on different parts of the lens. At the top it will have your distance prescription and will gradually change to the correct strength for reading at the bottom. In between there will be an area that is suitable for intermediate distances such as computer screens.
The image above displays two varifocals, the left is a standard varifocal and the right one is a premium varifocal. You can see on both images the field of view, this is main difference between varifocal lenses.
The standard varifocal offers a narrow field of vision (FOV) which means more head movement in the intermediate and reading areas of the lens, this mostly effects tasks such as reading and using the computer.
The premium varifocal offers a much wider field of view which makes it much easier to undertake tasks at an intermediate or near distance and less head movements. This wider field of view also makes it easier to adapt to the lens.
If you’d like to know more about the varifocals we offer you can follow one of the links on the right or you can contact us where we are happy to answer any questions you may have.