1.56 Semi-Finished Progressive Lens

Progressive lens are line-free multifocals that have a seamless progression of added magnifying power for intermediate and near vision.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 lens. The semi-finished lens 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 lens and prevents yellowing.

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1.56 progressive semi-finished optical lens
Model:	1.56 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin
Bending	100B/300B/500B
Function	progressive & semi-finished
Lenses Color	Clear
Refractive Index:	1.56
Diameter:	70
Abbe Value:	34.7
Specific Gravity:	1.27
Transmittance:	>97%
Coating Choice:	UC/HC/HMC
Coating color	Green

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