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Quality Control of Lenses |
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| General |
| Both mineral (glass) and hard resin lenses conform to the following standards ISO8980-1-2004, ISO8980-2-2004, ISO8980-3-2003, ISO8980-4-2006, ISO8980-
5-2005, ISO10322-1-2006, ISO10322-2-2006, ISO13666-1998, ISO14889-2003, GB10810-1-2005, GB10810-2-2006, GB10810-3-2006, QB2682-2005 and QB/T2702-
2005; hard resin lenses also conform to QB2506-2001 standard. Quality control system of the Seller passed ISO9002 (2000) standard. The Seller offers 1-year
limited warranty. |
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| Material & Surface Shortcomings |
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| 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 |
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| Cosmetic inspection is carried out by experienced inspectors based on Carl
Zeiss Master Plate. The following table is only a recommendation to the
inspectors since cosmetic inspection is totally subjective. Unless special
noticed, all lenses offered in this Purchase Guide are first quality lenses. |
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Carl Zeiss Master Plate |
Cosmetic Inspection |
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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. |
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| Zone B |
If width≤ 0.15mm, length≤ 2.0mm, 1 allowed. |
If width≤ 0.3mm, length≤ 7.0mm, 3 allowed,
but not centralized. |
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| Zone C |
If width≤ 0.25mm, length≤ 5.0mm, 2 allowed,
but not centralized. |
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If width≤ 0.3mm, length≤ 10.0mm, 3 allowed,
but not centralized. |
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| Dots |
Zone A |
Not allowed. |
If diameter≤ 0.2mm, 2 allowed, But not centralized. |
| Zone B |
If diameter≤ 0.25mm, 1 allowed. |
If diameter≤ 0.3mm, 3 allowed, But not centralized. |
| Zone C |
If diameter≤ 0.25mm, 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≤ 0.25mm, 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. |
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| 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. |
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| Drop Ball Test |
| Drop ball test is made according to FDA 21CFR801.410 standard. |
Power Testing & Marking |
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Random Check |
| 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 |
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| Random Check |
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