| The word "vary" is commonly used to describe a | | | | sorts of lenses for near vision have a certain amount |
| group of things that are different from each other in | | | | of focal points. However, varifocal specs use lenses |
| size, shape and so on. When it is applied to eyeglasses | | | | that do not have such a fixed amount. The name |
| or spectacles, what does it mean? People without a | | | | proves this convincingly. In fact, a varifocal lens has a |
| background of the phrase varifocal specs may get | | | | gradient of increasing lens power. The top of the lens |
| confused and want to know what they exactly are. In | | | | has a minimum power or nothing, while the bottom |
| brief, varifocal spectacles are made of varifocal | | | | comes with a maximum magnification power. Power |
| lenses, which have more widely known names like | | | | transition in such a lens is gradual and smooth. It is |
| progressive addition lenses, progressive power lenses | | | | impossible to figure out a detailed number of lens |
| and gradual lenses. These lenses vary greatly from | | | | powers or focal points. |
| bifocal lenses and trifocal lenses. It is easier to | | | | Wearing a pair of varifocal specs, presbyopic patients |
| understand from the aspect of focal point. Varifocal | | | | can get vision correction at all distances. They can |
| means that the lenses have varying focal points. How | | | | manage things at different viewing distances by seeing |
| can an eyeglass lens have varying or uncertain focal | | | | through specific lens parts. Since varifocal glasses use |
| points or powers? | | | | lenses with a set of increasing powers, wearers will |
| People with the least knowledge of presbyopia | | | | not experience visual discontinuities. |
| correction may be clear that regular reading glasses | | | | C: Varifocal specs are made of lenses that have a |
| are single vision or have only one focal point or power. | | | | varying amount of focal points. By providing a gradient |
| And a bifocal lens has two focal points or lens powers, | | | | of increasing lens power, visual discontinuities can be |
| while a trifocal lens has three. In conclusion, all these | | | | avoided. |