General Conditions
  CR-39 Hard Resin Lenses
  1.56 Middle Index Hard
  Resin Lenses
  1.56 Photochromic Hard
  Resin Lenses
  1.59 Polycarbonate
  Lenses
  1.61/1.67 Hi-Index Hard
  Resin Lenses
  Mineral White 1.523
  Optical Lenses
  Mineral 1.7/1.8/1.9
  Hi-index Lenses
  Mineral Photochromic
  Lenses
  Sunlens & Polarized
  Lenses
  Coating
  Quality Control of Lenses
  Package of Lenses
 
 
 Quality Control of Lenses
 
General
Both mineral (glass) and hard resin lenses conform to the following standards: ISO8980-1-2017, ISO8980-2-2017, ISO8980-3-2013, ISO8980-4-2006, ISO8980-5-2005, ISO10322-1-2016, ISO10322-2-2016, ISO13666-2012, ISO14889-2013, ISO/TR28980-2007, GB10810-1-2005, GB10810-2-2006, GB10810- 3-2006, GB10810-4- 2012, GB10810-5-2012, GB27995-1-2011, GB27995-2-2011, QB2682-2005, QB/T2702-2005. Hard resin lenses also conform to QB/ T2506-2017 standard. Quality control system of Y&S is ISO9001 (2015) certified. Y&S offers a 1-year limited warranty.
 
Material & Surface Shortcomings    
Each lens is divided into 3 zones as shown in the Carl Zeiss Master Plate.    
Lens Diameter Zone A Zone B Zone C
55mm 30.0mm
9.5mm
3.0mm
60mm 30.0mm 12.0mm 3.0mm
65mm 35.0mm 12.0mm 3.0mm
70mm 40.0mm 12.0mm 3.0mm
72mm 45.0mm 10.5mm 3.0mm
Cosmetic inspection is carried out by experienced inspectors based on the Carl Zeiss Master Plate. The following table is only a recommendation to the inspectors since cosmetic inspection is totally subjective. All lenses offered in this Purchase Guide are first quality lenses, unless notified. Carl Zeiss Master Plate Cosmetic Inspection
     
 
    1st Quality Lens 2nd Quality Lens
 Scratch Zone A  If width ≤ 0.1mm, length ≤ 2.0mm, 1 allowed.  If width ≤ 0.3mm, length ≤ 5.0mm, 2 allowed,
 but not centralized.
Zone B  If width ≤ 0.1mm, length ≤ 2.0mm, 1 allowed.  If width ≤ 0.3mm, length ≤ 7.0mm, 3 allowed,
 but not centralized.
Zone C  If width ≤ 0.2mm, length ≤ 5.0mm, 2 allowed,
 but not centralized.
 If width ≤ 0.3mm, length ≤ 10.0mm, 3 allowed,
 but not centralized.
 Dots Zone A  Not allowed.  If diameter ≤ 0.2mm, 2 allowed, But not centralized.
Zone B  If diameter ≤ 0.2mm, 1 allowed.  If diameter ≤ 0.3mm, 3 allowed, But not centralized.
Zone C  If diameter ≤ 0.2mm, 2 allowed,but not centralized.  If diameter ≤ 0.5mm, 3 allowed, But not centralized.
 Bubbles Zone A  Not allowed.  Not allowed.
Zone B  Not allowed.  If diameter ≤ 0.5mm, 1 allowed.
Zone C  If diameter ≤ 0.5mm, 1 allowed.  If diameter ≤ 0.5mm, 1 allowed.
 Inclusions Zone A  Not allowed.  Not allowed.
Zone B  Not allowed.  If diameter ≤ 0.5mm, 1 allowed.
Zone C  If diameter ≤ 0.2mm, 1 allowed.  If diameter ≤ 2.0mm, 1 allowed.
 Chips Zone A  Not allowed.  Not allowed.
Zone B  Not allowed.  Not allowed.
Zone C  If width ≤ 0.5mm, length ≤ 2.0mm, 1 allowed.  If width ≤ 1.0mm, length ≤ 3.0mm, 2 allowed, 
 but not centralized.
 
Power Testing & Marking
Power of each lens is inspected and printed on the lens cover by Y&S Power Testing & Marking System. To avoid personal mistake, lens power is tested by computerized lensmeter piece by piece, data will be transferred to computer automatically, power and descriptions are printed onto the lens cover at the same time.
 
Drop Ball Test
Drop ball test is carried according to FDA 21CFR801.410 standard. Power Testing & Marking
 
Random Check
The random check is made according to ISO2859, ISO3951, and GB2828 standards, parameters for the sampling are Level 2, AQL 4.0.
Lot Size (Pieces) Sample Size (Pieces) Max. Rejection (Pieces)
90 - 150
151 - 280
281 - 500
501 - 1,200
1,201 - 3,200
3,201 - 10,000
10,001 - 35,000
20
32
50
80
125
200
315
2
3
5
7
10
14
21
Random Check  
 
Copyright 2018 Y & S (Beijing) Opto-Electro Industries Ltd. All Rights Reserved.