Varifocal lenses allow you to see near and far using only one pair of glasses, without any abrupt change and the advantage that there is no visible line in the lens, only an even transition from near to far.
Basically, varifocal lenses help you see things clearly at all distances.
Varifocal lenses take a little time to get used to, but once you are used to them, you will find that you can see clearly at all distances.
Varifocal lenses are available in several designs, by design this is referring to the differences between the areas allocated through the distance, intermediate and reading zones.
Varifocals are designed so that when you are looking straight ahead you look through the distance section of the lens.
The reading zone is the lower part of the lens and the middle section of the lens allows you to view anything at arms length distance.
The wearer can adjust the lens power required for clear vision at the different viewing distances by tilting his, or her, head to view through the appropriate section of the varifocal progression.
Because near vision, such as when you are reading, is usually at a low visual field, this is the reason for the lower part of the lens being powered for near visual tasks.
Previous or older varifocal designs had a large distortion zone complexity, which often made it more difficult for the wearer to adjust to.
Today, however, newer technology has made way for reduction of the size of the distortion areas, allowing easier adjustment for the wearer.
The new varifocal lenses provide much wider viewing zones, therefore, giving a much clearer and more comfortable view.
Because these newer designs of Varifocal lenses are easier to get used to, there is now only a small majority of people who may never get used to wearing varifocals.