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Differences between progressive vs. bifocal lenses: Which one to choose to correct your vision?
Presbyopia is not synonymous with old age, especially since technological and scientific resources in the design of prescription glasses allow us to advance towards vision as good as that of a twenty-year-old.
There are many types of glasses , and among them are glasses for presbyopia. Progressive glasses are one of our best options to treat it, but before them there were bifocals.
At Bassol Optics , we tell you the difference between progressive and bifocal lenses, as well as their history and current advances. Take note of their characteristics so that you can always make the best decision for your visual health.
Differences between progressive and bifocal glasses
In the following table we summarize the most important differences between both types of glasses for presbyopia.
|
Progressive vs. bifocal glasses |
||
|
FEATURE |
BIFOCAL GLASSES |
PROGRESSIVE GLASSES |
|
Vision Zones |
Two distinct areas |
Gradual glass transition in several areas |
|
Manufacturing |
Segmentation or furrowing |
Digital carving or aspherical molding |
|
Junction line |
Visible and unsightly |
Absent and aesthetics |
|
Field of view |
Limited for intermediate distances |
Wide at all distances |
|
Adaptation |
It requires an adaptation period |
Faster adaptation |
|
Price |
More economical |
More expensive |
Bifocal glasses, what are they?
The history of bifocal lenses dates back to the 18th century, when Benjamin Franklin (1706-1790) devised a system to correct presbyopia . His ingenious solution consisted of cutting two lenses of different prescriptions and joining them with a metal frame, which gave rise to the first bifocal glasses.
The top part of the lens was graduated for distance vision, the bottom part was for near vision.
Although this design was rudimentary and had some limitations, such as the visible line separating the two vision zones, it was a major advance for people suffering from presbyopia, allowing them to see clearly without having to constantly change glasses.
Evolution and improvement of bifocal glasses
Throughout the 19th and 20th centuries, bifocal lenses were refined. New materials, more ergonomic designs and prescriptions were optimized to offer greater comfort and visual precision.
However, the visible line separating the two vision zones was still an aesthetic inconvenience and limited vision. The arrival of progressive lenses was a leap towards natural vision.
Progressive glasses, what are they?
In the 1950s, a new milestone in presbyopia correction materialized with the invention of progressive lenses.
Progressive lenses , or multifocal lenses, offer clear vision at all distances (near, middle, far). They consist of a lens designed to correct presbyopia , an eye condition that affects the ability to focus on nearby objects as we get older (after age forty).
Unlike bifocals, which have visible lines separating vision zones (down for near, up for far), progressive lenses offer an organic transition in prescription , providing more natural vision at all distances.
How do progressive glasses work?
There are different types of progressive lenses with different fields of sharp vision and technologies. The surface of progressive lenses is modified through a digital milling or aspheric molding process, creating a variable curvature that gradually changes along the length of the lens.
This variable curvature allows the lens to focus light differently in different areas, providing clear vision for distant, intermediate, and near objects.
Progressive lenses are a solution for people who need glasses to see near and far. They are also a solution for people who, in addition to presbyopia, have another visual condition such as myopia, astigmatism or hyperopia.
What is the field of vision of progressive lenses?
The field of vision in progressive lenses refers to the area of the lens through which the user can see clearly at different distances . One of the main differences between progressive and bifocal lenses is that the former offer a gradual transition between distance and near vision, thus offering a wider field of vision.
Factors that influence the field of vision in progressive lenses
The field of vision in progressive lenses can vary depending on several factors, such as:
- Lens Design: Digital progressive lenses typically offer a wider field of vision than traditional progressive lenses.
- Eyeglass frame: The shape and size of the frame can also affect the field of vision. A well-fitting frame, such as one that is straighter at the bottom, maximizes the field of vision.
- Visual needs of the user: Some people only need glasses for reading.
How do you know if progressive lenses are not right for you?
If you suspect that your progressive lenses are not working properly, pay attention to the following signs:
- Blurry or distorted vision: If you notice this in any area of the lens, especially when changing from distance to near vision or vice versa, it may be an indication that the glasses are not correctly graduated or that the frame does not fit your face well.
- Difficulty focusing: If you have trouble focusing in situations such as reading or using the computer, it may be that the intermediate or near vision zones of the lenses are not properly graduated.
- Dizziness or headaches: If you experience these symptoms after wearing your progressive lenses for a while, it may be a temporary side effect while you adjust to the lenses.
Progressive lenses vs. bifocal lenses: Which glasses should you choose to correct your vision?
The best choice for presbyopia depends on your needs. However, in terms of quality and comfort, progressive lenses are the best choice .
The Best Frames for Progressive Glasses
The factors we have indicated in the field of vision are decisive in choosing the ideal frame for you. We show you these three models so that you have an idea of the endless possibilities:
1. Prada PR A19V 17N1O1 52
This Prada model with its straight line at the bottom provides a sharper close vision . The frame is wide, so you will have a favorable field of vision at all distances without losing a bit of glamour. Get them in the following colors:
- Havana
- Havana clear
- Transparent
- Blacks
- Transparent rose
Enjoy spectacular Ray Ban glasses at a bargain price with this frame, ideal for progressive lenses. Don't hesitate and try them at Óptica Bassol! Wear them in any of the following shades:
- Grays
- Blues
- Transparent
These Tom Ford glasses come in a high-quality injected material , which guarantees their flexibility and lightness. They also have a rectangular shape that is ideal for progressive lenses. Enjoy them! Available colours are:
- Blacks
- Havanas
Presbyopia is just another stage in our lives, and we can overcome it with style and elegance. If you have symptoms of discomfort with your progressive lenses, consult your ophthalmologist.
The ideal way to avoid problems with your glasses is to have them designed by a professional. At Óptica Bassol we advise you on the selection of your glasses for presbyopia and sunglasses .
Visual health is important and has many allies. Come to Óptica Bassol , you will find your dream glasses in any of our branches , or place your order online and enjoy the seasonal offers . Don't let presbyopia stop you from living your best life!
