1）What are the main anti-blue light technologies? ① film layer reflection technology: through the lens surface coating to reflect blue light, so as to achieve blue light blocking effect. ②substrate absorption technology: through blue light cut elements added in monomer of lens and blue light absorption so as to achieve blue light blocking effect. ③film layer reflection + substrate absorption: this is the latest anti blue light technology which combines the advantages of the above two technologies and doubles effect protection.2）The definition of semi finished lens ①Semi-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. ②The 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.3. What is the difference between HC, HMC and SHC？

Hard coating	AR coating/Hard multi coating	Super hydrophobic coating
makes the uncoated lens hard and increases the abrasion resistance	increases the transmittance of the lens and reduces surface reflections	makes the lens waterproof, antistatic, anti slip and oil resistance

1.60 semi-finished blue block single vision optical lens
Model:	1.60 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin
Bending	50B/200B/400B/600B/800B
Function	blue block & semi-finished
Lenses Color	Clear
Refractive Index:	1.60
Diameter:	70/75
Abbe Value:	32
Specific Gravity:	1.26
Transmittance:	>97%
Coating Choice:	UC/HC/HMC
Coating color	Green