|Abbe value||Specific Gravity||Transmission|
|Coating Choice||Power range|
|UC/HC/HMC||ADD: +100~ +350; Base: 2/4/6/8|
II. Technical Data
Progressive lenses, sometimes called "no-line bifocals," give you a more youthful appearance by eliminating the visible lines found in bifocal (and trifocal) lenses.
Progressive lenses more closely mimic the natural vision that you enjoyed before the onset of presbyopia. Instead of providing just two lens powers like bifocals (or three, like trifocals), progressive lenses are true "multifocal" lenses that provide a smooth, seamless progression of many lens powers for clear vision across the room, up close and at all distances in between.
Discover five compelling reasons to take advantage of the leading innovations in the Varilux product range.
1. Clear vision at any distance
Near or far, the Varilux range gives you clear vision whatever the distance.
2. Total comfort in any task
Whether at work with a computer, using a smartphone or tablet screen, or simply reading the news paper, the Varilux range provides total comfort.
3. High resolution vision in any light
Varilux Physio lets you enjoy greater contrast and sharpness. The increase in quality is comparable to a full HD TV over a standard television.
4. Dynamic vision steady in motion
Great for sports and staying active, the Varilux range allow you to see perfectly - even in motion. Lenses are tailored to your visual behavior.
5. Quick adaptation
All Varilux lenses are tested and approved by wearers to ensure your satisfaction, including fast and easy adaptation. With Varilux lenses, adaptation is guaranteed.
The definition of semi finished lens
Semi-finished lens is the raw blank used to produce the most individualized RX lens according to the patient's prescription. Different prescription powers request for different semi-finished lens types or base curves.
The process of semi finished lens
The starting point for freeform production is a semi-finished lens, also known as a puck due to its resemblance to an ice hockey puck. These are produced in a casting process that is also used to manufacture stock lenses. The semi-finished lenses are produced in a casting process. Here, liquid monomers are first poured into moulds. Various substances are added to the monomers, e.g. initiators and UV absorbers.
What's the importance of a good semi-finished lens to RX production
a. High qualified rate in power accuracy and stability
b. High qualified rate in cosmetics quality
c. High optical features
d. Good tinting effects and hard-coating/AR coating results
e. Realize the maximum production capacity
f. Punctual delivery
Not just superficial quality, semi-finished lenses are more focus on the internal quality, such as precise and stable parameters, especially for the popular freeform lens.