Varifocal vs Occupational Lenses
Progressive Power Lenses (PPL), commonly known as ‘Varifocal’ lenses are generally recommended by Optometrists and Dispensing Opticians when you have a two prescription requirement. Typically, one for distance vision and one for near vision.
These lenses are designed in a manner that they have a gradual change incorporated into the strength of the prescription from the top of the lens where the distance portion is set, to the bottom with multiple focal points allowing you to see clearly at all distances through just a single lens.
This effectively means that you don’t need to purchase two pairs of glasses for two different distances.
In comparison to traditional bifocals, they don’t contain a reading segment as such with a visible dividing line. This eliminates ‘Jump’ (difference in sudden magnification between focal lengths) from within the lens which makes them much more functional and cosmetically pleasing. Also, they disguise age very well as onlookers cannot tell the type of lens you’re wearing.
There are 3 portions to a varifocal lens:
Distance Portion: Where the distance component of your prescription is set
Intermediate Portion: The progressive portion between the distance prescription and the
near prescription. Also referred to as the ‘Visual Corridor’.
Near Portion: Where the reading/close up component is set.
Varifocal lenses are generally very easy to adapt to providing that all the measurements pertaining to varifocal lenses are taken correctly during the dispensing process. A full consultation with your optician is imperative in obtaining the right varifocal lens for your use. Varifocal lenses are positioned so that you look through the top portion of the lens to view distance objects. However for reading, you simply lower your gaze to look through the bottom. Also, they have an intermediate power range which is a useful transition between both areas of viewing.
There are numerous different types of varifocal lenses available each offering several features and benefits dependent upon your lifestyle and requirements.
The core differences between them are as follows:
Larger reading viewing areas.
Wider field of vision, known as the ‘visual corridor’.
Less peripheral distortion
In comparison, more advanced lens options provide a wider field of vision with less peripheral distortion (soft focus) hence easier adaptation, comfort and performance.