|1.56 Semi Finished Lens|
|Material: 1.56 Index Resin(Ne=1.530, Abbe value=44, Specific gravity=1.10 )|
1. The definition and production of semi-finished lenses
Semi-finished lens is the raw blank used to produce the most individualized RX lens according to thepatient's prescription. Different prescription powers request for different semi-finished lens types or base curves.
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. The initiator triggers a chemical reaction that leads to hardening or "curing" of the lens, while the UV absorber increases the UV absorption of the lenses and prevents yellowing.
2. Minus and plus semi-finished lenses
Lenses with different dioptric powers can be made from one semi-finished lens. The curvature of the front and back surfaces indicates whether the lens will have a plus or minus power.
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.
Rather than just the cosmetic quality, semi-finished lenses are more about the inner quality, such as precise and stable parameters, especially for the prevailing freeform lens.
1) High qualified rate in power accuracy, tability, cosmetics quality
2) High optical features
3) Good tinting effects and hard-coating/AR coating results
4) Realize the maximum production capacity
5) Punctual delivery
It also can be named as anti-scratch coating, the function of this coating is to protect the surface of the lenses from impact and scratch reisitance.
It also can be named as hard multi coated, that means coating an anti-reflective film on the hard coating lens, can protect the lens effectively from reflection and glare, enhance functional and charity of your vision
Super Hydrophobic Coating
To make the lens waterproof, antistatic, anti slip and oil resistance.