Semi Finished prescription 1.59 PC polycarbonate HMC AR coating flat top bifocal ophthalmic lens blanks

1. Semi Finished Lens

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. Flat Top Bifocal Lenses

When people inch closer to forty, they may find that their eyes are not adjusting to distances as they used to, the lens of the eyes begin to lose flexibility. It becomes difficult to focus on close objects. This condition is called presbyopia. It can be managed to a large extent with the use of bifocals. Bifocals are two lenses in one. They’re shaped differently at the bottom and top to help you see close up or far away. They come in both eyeglasses and contact lenses. Some bifocal glasses have a line across the middle that divide the two corrections.

3. Polycarbonate lenses

Polycarbonate lenses are highly resistant to impact, won’t shatter. They are 10 times stronger than glass or standard plastic, making them ideal for children, safety lenses, and outdoor activity.
Lightweight and thinner than glass lenses, polycarbonate is more comfortable to wear for long periods of time.
Due to the light weight and flexibility of polycarbonate, these lenses are easier to remove and install than glass lenses, and are available in more styles of sunglasses that cannot accommodate heavy glass lenses.

Hard Coating(HC): To enhance the hardness of the lens to prevent the substrate scratch

Anti-reflection Coating(HMC/ AR): To protect the lens effectively from reflection, enhancing functional and charity of your vision

Super hydrophobic Coating(SHMC): To make the lens waterproof, antistatic, anti slip and oil resistance