1.56 Semi-Finished Photochromic Lens

The molecules responsible for causing the photochromic lens to darken are activated by the sun’s ultraviolet radiation. Because UV rays penetrate clouds, photochromic lens will darken on overcast days as well as sunny days. Photochromic lens typically will not darken inside a vehicle because the windshield glass blocks most UV rays. Recent advancements in technology allow some photochromic lens to activate with both UV and visible light, providing some darkening behind the windshield.

Semi-finished lens is the raw blank used to produce the most individualized RX lens according to the patient’s prescription. Different prescription powers are required for different semi-finished lens types or base curves.

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1.56 photochromic semi-finished optical lens
Model:	1.56 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin
Bending	50B/200B/400B/600B/800B
Function	photochromic & semi-finished
Lenses Color	Clear
Refractive Index:	1.56
Diameter:	75/70/65
Abbe Value:	39
Specific Gravity:	1.17
Transmittance:	>97%
Coating Choice:	UC/HC/HMC
Coating color	Green

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