As Chinese lens manufacture, we usually divided lens into three types based on their structure: single vision lens, bifocal lens and progressive lens.
In this article we will introduce their difference and suitable clients in detail.Hope can help more and more optical industry workers understand them more clear.
1.Single vision lens
It means there are one optical focal point on entire lens, It’s only used to see things up close or far away.
It is typically used for teenagers with myopia, or adults with myopia/hyperopia/astigmatism, as well as those who only need near vision or only need far vision.
https://trust-lens.com/product-category/finished-lenses/Single-vision lenses are among the most commonly used lenses in daily life. Currently, 80% of our best-selling models are single-vision lenses.
Such as the 1.56 single vision coated lens, 1.56 single vision blue cut lens, 1.56 single vision photogrey lens, and 1.56 single vision photogrey blue cut lens.
These lens models can meet the daily needs of 80% of users, so they are stock available. The power range covers SPH: +6.00 to -6.00 and CYL: 0.00 to -6.00, enabling fast delivery within 3-5 days after ordering.
This helps optical lens buyers achieve fast delivery and rapid turnover.
2. Bifocal Lenses
Bifocal lenses have two optical focal points, one for near vision and one for far vision, allowing for near and far vision with a pair of lens.
The circular area below the lens is for close-up vision, such as reading or working.The area above the circle is for distance vision, such as driving.
Based on appearance, bifocal lenses can be divided into three types: flat-top bifocal lenses, round top bifocal lenses, and invisible round top bifocal lenses.
Flat top bifocal lens its surface is a semicircle.The top edge is a straight line.
Round top bifocal lenses have a complete circular shape, and its boundary is clear.
The invisible round top bifocal lens has indistinct boundaries, making it more Stylish and beautiful.
Below are images of the three types for your reference. From the images, we can clearly see the differences between them:
This type of lens is suitable for people with presbyopia who need to switch between near and far vision, but its mid-range support is weak. Its power range is: SPH: +300~-200 ADD: +100~+300
It should be noted that bifocal lenses are usually available in 70mm and 65mm sizes, with a significant price difference. Therefore, you need to determine the appropriate size before purchasing.
3. Progressive Lenses
Also known as Multifocal Lenses, these lenses combine the required power for far, intermediate, and near vision into a single lens, allowing users to meet their vision needs at all three distances with a single pair of lenses. The transition is natural and easy to adapt to.
Their power range is: SPH: +300~-200 ADD: +100~+300
Progressive lenses come in three types based on corridor: 9+4, 12+2, and 12+4.
The required corridor length is usually determined by your prescription, so you need to have your optometrist take your measurements during your eye exam.
This will allow them to directly match the appropriate lenses and frames based on your test data.
To learn more about the differences of corridor: 9+4, 12+2, and 12+4. you can refer to this article:
There is no single best lens, only the lens that best suits you. Therefore, the most important thing when choosing lenses is finding the right lens for you.
I have introduced the characteristics and target audiences of the three lens designs mentioned above. You can choose based on the target audience and your own usage scenarios.
Want to get lens samples to check product quality? Contact us now.
