What is the sunglasses quality standard?

High-quality sunglasses always leave a lasting first impression, particularly with their delightful touch and striking visuals, often evoking a “love at first sight” sensation.

Are you aware that for us, a professional eyewear manufacturer, we follow meticulous international quality standards for eyeglasses? These standards encompass establishing tolerances and guidance on how to inspect the intricate details of eyewear quality.

Table of contents

1. Sunglasses Quality Standard Compliance

Quality Standard Compliance should not be confused with our Quality Tolerances or QC Inspections. In terms of this guide, Quality Standard Compliance refers to the multiple global standards for ophthalmic and sunglass frames.

All iDetail Eyewear Manufacturer products must comply with the following standards and directives :

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Copies of standards can be purchased online at http://www.ISO.org or http://www.ansi.org and directives can be searched on the internet.

2. Quality Sunglasses Production: Detailed Specifications for Exceptional Eyewear

Table of contents

1. Hand Made Acetate Full Rim :

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  • The minimum thickness for zyl frame eyerims is 2.0 mm top to bottom x 4.0 mm front to back. Producing eyewear with dimensions less than this specification has an increased risk of broken and deformed eyerims.

  • Refer to the Eyerim Groove section of this manual for groove shape and lens bevel shape.

  • Groove depth must be at least 0.75 mm for maximum lens retention. Any groove depth less than 0.75 may result in lenses not being completely secure in the eyerim.

  • For 8 base frames, groove depth may range from 0.75 mm to 1.0 mm. 

  • The nasal flange/ nose pad height should be 8.5 mm for optical and 9.5 mm for sun. AF versions should use 12.5 -13 mm flange height for both optical and sun, Universal fit uses a nasal flange/ nose pad height of 10.5 mm.

  • Hinge types will be specified when the model is in the development stage, however it is suggested to use a stop hinge for 8 base sunglasses to prevent the tip end from touching the back of the lens when the temples are closed.

  • Optical frames require 1.0-1.2 mm clear acrylic demo lenses.

  • Sunglasses: CR39, or nylon lens material. Polycarbonate lens material MUST NOT be used with handmade frames as there is a chemical reaction that occurs.

  • Sun lenses that are 8 base must be decentered to avoid optical distortion and provide wearer comfort.

  • Sun lenses that are less than 6 base should have anti-reflective coating applied to the backside to reduce spectral image.

2. Injected-Full Rim :

injected-full rim for high quality sunglasses

TR90 injection material comes in different grades of quality. Not all grades are chemical resistant or impact resistant.

  • The minimum thickness for an injected frame eyerims is 1.8 mm top to bottom x 4.0 mm front to back. Producing eyewear with dimensions less than this specification has an increased risk of broken and deformed eyerims.

  • Injection thickness should be produced within +/- 0.2 mm specified on the CAD drawing.

  • Refer to the Eyerim Groove section of this manual for groove shape and lens bevel shape.

  • Groove depth must be at least 0.75 mm for maximum lens retention. Any groove depth less than 0.75 may result in lenses not being completely secure in the eyerim.

  • For 8 base frames, groove depth may range from 0.75 mm to 1.0 mm. It is the vendor’s responsibility to inform iDetail of the groove depth via the CAD drawing.

  • For 8 base frames, groove depth may range from 0.75 mm to 1.0 mm. It is the vendor’s responsibility to inform iDetail of the groove depth via the CAD drawing.

  • The nasal flange height should be 8.5 mm for optical and 9.5 mm for sun.  Universal fit uses a nasal flange/ nosepad height of 10.5 mm.

  • Hinge types will be specified when the model is in the development stage, however it is suggested to use a stop hinge for 8 base sunglasses to prevent the tip end from touching the back of the lens when the temples are closed.

  • Optical frames require 1.0-1.2 mm clear acrylic demo lenses.

  • Sunglasses: Polycarbonate or nylon lens material. CR39 may be used, but cracking and chipping can occur.

  • Sun lenses that are 8 base must be decentered to avoid optical distortion and provide wearer comfort.

  • Sun lenses that are less than 6 base should have anti-reflective coating applied to the backside to reduce spectral image.

All injection frames must not use heat above 150 degrees due to possible damage. Lenses must be cold inserted only.

3. Metal Full Rim :

Metal Full Rim for quality sunglasses
  • The minimum thickness requirements for Stainless steel, Titanium, and Beta-titanium eye rims are 0.85 mm top to bottom x 1.9 mm front to back. Monel/ nickel silver eyerim minimum thickness should be 1.0 mm top to bottom x 1.9 mm front to back. Producing eyewear with dimensions less than this specification has an increased risk of broken or deformed eyerims.

  • Metal thickness should be produced within +/- 0.1 mm specified on the CAD drawing.

  • Refer to the Eyerim Groove section of this manual for groove shape and lens bevel shape.

  • Groove depth must be at least 0.45 mm for maximum lens retention. Any groove depth less than 0.45 may result in lenses not being completely secure in the eye rim.

  • Rimlocks with minus (-) head safety screws are required for all metal eyerims in order to easily insert and remove lenses. In addition, the rimlock provides stress relief for lenses inserted in the eyerims.

  • Hinge types will be specified when the model is in the development stage, however it is suggested to use a stop hinge for 8 base sunglasses to prevent the tip end from touching the back of the lens when the temples are closed.

  • Optical frames require 1.0-1.2 mm clear acrylic demo lenses.

  • Sunglasses: CR39, Polycarbonate, or nylon lens material.

  • Sun lenses that are 8 base must be decentered to avoid optical distortion and provide wearer comfort.

  • Sun lenses that are less than 6 base should have anti-reflective coating applied to the backside to reduce spectral image

4. Metal Full Rim Milled :

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  • The minimum thickness requirements for Stainless steel, Titanium, and Beta-titanium full rim milled are 0.80 mm top to bottom x 1.8 mm front to back. Monel/ nickel silver eyerim minimum thickness should be 1.2 mm top to bottom x 1.8 mm front to back. Producing eyewear with dimensions less than this specification has an increased risk of broken or deformed eyerims.

  • Metal thickness should be produced within +/- 0.1 mm specified on the CAD drawing.

  • Refer to the Eyerim Groove section of this manual for groove shape and lens bevel shape.

  • Groove depth must be at least 0.45 mm for maximum lens retention. Any groove depth less than 0.45 may result in lenses not being completely secure in the eyerim.

  • Rimlocks with minus (-) head safety screws are required for all metal eyerims in order to easily insert and remove lenses. In addition, the rimlock provides stress relief for lenses inserted in the eyerims. We prefer the rimlocks to be located away from the pad arm, but hidden from side view.

  • Hinge types will be specified when the model is in the development stage; however it is suggested to use a stop hinge for 8 base sunglasses to prevent the tip end from touching the back of the lens when the temples are closed.

5. Semi-Rimless :

Semi-Rimless for high quality sunglasses
  • Acetate semi-rimless minimum thickness should be 2.0 mm top to bottom x 4.0 mm front to back. Stainless steel, Titanium, and beta-titanium semi-rimless minimum thickness should be 0.85 mm top to bottom x 1.85 mm front to back. Monel/ Nickel silver semi-rimless minimum thickness should be 1.1 mm top to bottom x 1.9 mm front to back. Producing eyewear with dimensions less than this specification has an increased risk of broken or deformed eyerims.
  • There are 2 different types of acceptable semi-rimless construction. The first type has 2 drill holes at the nasal and temporal rims with a plastic bushing or galley in the top rim. This type is typically used for metal semi-rimless eyerims.
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  • The second, less preferred type of construction has 2 drill holes at the nasal and a one hole tap at the temporal eye rim with a T-profile in the top rim. This construction should only be used for acetate semi-rimless or milled flat metal semi-rimless temporal rims with a plastic bushing or galley in the top rim. This type is typically used for metal semi-rimless eyerims.

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  • Optical frames require 2.0 mm clear acrylic demo lenses.

6. Three Piece Mounting (Drill Mount) :

Screw mount and compression mount

There are two basic types of three piece mountings: screw mount and compression mount. Three piece mountings are called such because they are made up of three different pieces, the end-piece and temple on the left and right sides as well as the bridge in the center connecting the two lenses. In both types, the lenses must be drilled or drilled and notched.

Screw Mount :

  • Minimum space between drill holes=3.4 mm

  • Minimum space from lens edge to center of drill hole =3.8 mm

  • Each frame must be packaged with a drill chart and spare components free of charge.

  • Standard drill hole size= 2.0 mm

Preferred screw-mount components

Preferred screw-mount components for quality sunglasses

Secondary screw-mount components

Secondary screw-mount components for high quality sunglasses

Compression Mount :

  • Minimum space between drill holes=3.0 mm

  • Minimum space from lens edge to center of drill hole =2.2 mm

  • Each frame must be packaged with a drill chart and spare components free of charge.

  • Standard drill hole size= 1.7 mm

Compression mount bushing 

DRILL HOLE for quality sunglasses

3. How to check quality of sunglasses

Most strict tolerances :Glasses Quality Checklist

  • Dimension defects – Rim dimension Boxing system of measurement for horizontal size of the lens 

  • Tools Required : Digital Calipers, sunglasses technical drawing , Spec Sheet 

A size – Horizontal size

B size – Vertical size

ED size – Diagonal

CIR size – Circumference

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Window size+ groove depth +groove depth=Boxing A size (Tolerance +/- 0.3 mm )

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Window size+ groove depth +groove depth=Boxing B size (Tolerance +/- 0.3 mm )

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Bridge size – groove depth -groove depth=DBL (Tolerance +/- 0.3 mm )

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  • Dimension defects – Screw dimension In any case, the screw must always protrude from the various housings.

  • Purpose/Method : Digital Calipers, Visual check and sunglasses tech drawing.

A: protrude length of spring screw (A+0.3mm)

B:Protrude length of Pad arm screw (B+0.2mm)

C:Protrude length of rim lock screw.(C+0.2mm)

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  • Structure : Poor soldering (excessive or messy) ( Not Allowed )

  • Purpose/Method : Visual check of excessive or messy solder at the solder joints

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  • Structure : Rolled eye rim/ deformed eyerim ( Not Allowed )

  • Purpose/Method : Visual check of the eyerim for twisting and deforming from front view

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  • Structure : Deformed bridge ( Not Allowed )

  • Purpose/Method : Visual check of the bridge for deformity

  • Structure : Deformed end-piece/end-piece issues ( Not Allowed )

  • Purpose/Method : Visual check of the end-peice for deformity

  • Structure : Any soft materials ( Not Allowed )

  • Purpose/Method :Hand check of the frame, which must not have any “soft” materials used.

  • Structure : Sharp point or edge will cause injury ( Not Allowed )

  • Purpose/Method : Visual and hand check of the frame, which must not have any extreme sharp edges.

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  • Structure : Any oxidation of metal ( Not Allowed )

  • Purpose/Method : Visual check of the frame for any oxidation of the metals.

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  • Assembly : Decoration parts are loose, scratched, or poorly applied ( Not Allowed )

  • Purpose/Method : Visual check and hand check to make sure decorations, adornments, and logos cannot be pulled off, peeled off, and are neatly applied.

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  • Assembly : Logo / rhinestone / leather / trim strength ( Not Allowed )

  • Tools Required : 3M tape, small metal bar, small plastic bar, cleaning cloth

Purpose/Method : 

  • Adhesion test – made by American or 3M tape. For rhinestones, use only 3M tape

  • Drop test (from a height of 30 / 50 cm)

  • Handling or deformation test

  • Rubbing test (made by a small metal / plastic bar)

  • Cleaning test (made by cloth)

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  • Assembly : Rimlock issues( Not Allowed )
  • Purpose/Method Visual check to ensure rimlock is free of defects and soldered in the correct location. Hand check to open and close the right and left side rimlock screw

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  • Lens : Lens popping out (Not Allowed )

  • Purpose/Method : Lens Test Methods , Hand check

  • Lens : Lens cracked/ chipped/ stress marks ( Not Allowed )

  • Purpose/Method : Visual check to ensure lenses are not cracked

Lens cracked for high quality sunglasses
  • Color : painting with color inconformity ( Not Allowed ) frame’s color can’t be changed under the light.

  • Purpose/Method :Visual with sample (color inconformity)

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  • Color : Color peeling (including paint, plating, and clear lacquer) NOT near logo ( Not Allowed )

  • Purpose/Method : Visual check to ensure no peeling is occurring

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  • Packaging : Wrong temple markings on frame ( Not Allowed )

  • Purpose/Method : Visual check to ensure the correct markings on temple

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  • Dimension : Inclination of pantoscopic angle (+/- 1 degree)

  • Purpose/Method : Visual check to ensure the correct markings on temple

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  • Dimension : Front Angle (+/- 1 degree)

  • Purpose/Method : Visual check to ensure the correct markings on temple

  • Tools Required : Protractor or Front Control Angle Chart, sunglasses technical drawing

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Lay the frame on the control sheet with the bridge flush with the bridge line. Read the line that the front end-piece is closest to.

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When using the protractor, the long bar must rest on the nasal eyerims of both eyes. Then, turn the protractor until the edge hits the temporal eyerim. Read the number and divide by 2.

  • Dimension :Temple closing angle            ( +/- 1 degree )

  • Purpose/Method Obtaining the angle of the temples when closed in relation to the horizontal axis of the frame.

  • Tools Required : Angle Control Chart, sunglasses technical drawing , Visual Inspection

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  • Dimension : Bending tip angle ( +/- 2 degrees ) and length (  +/- 2 mm )

     
  • Purpose/Method : Using a protractor, measure the angle of the tip bend. Using a ruler, measure from the area the bend begins to the tip end.

  • Tools Required : Protractor, Millimeter ruler, sunglasses technical drawing

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  • Dimension : Overall front ( +/- 2 mm )

  • Purpose/Method Measure the overall distance of the front from the outside end-piece to the outside end-piece

  • Tools Required : Digital calipers, sunglasses technical drawing

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  • Dimension Hinge to hinge measurement ( +/- 2 mm )

  • Purpose/Method : Measure the distance between the center of the right hinge screw and the center of the left hinge screw.

  • Tools Required : Digital calipers, sunglasses technical drawing

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  • Dimension : Widest point ( +/- 2 mm )

  • Purpose/Method : Measure the distance between the widest points on the inside of the temples when the temples are open.

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  • Dimension : Tip to tip distance ( +/- 2 mm )

  • Purpose/Method : Measure the distance between the inside of the right and left temple tip ends when the frame is open.

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  • Dimension : Bench Alignment (4-point touch) ( 2 mm or less)

  • Purpose/Method : Visual check – When the temples are open and on a flat surface, both eye rims and both temple tips must touch the table.

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  • Structure : Metal rim does not match plastic eyerim ( Allow gap of 0.1 mm or less )

  • Purpose/Method : Visual check for gaps between the plastic and metal eyerim.
  • Structure : Eyerim off axis ( +/- 1 degree )

  • Purpose/Method : Visual check that eyerims are on horizontal axis

  • Tools Required : Visual check , Prescription aligner , sunglasses technical drawing

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  • Structure : Bridge solder slanted ( Not allowed )

  • Purpose/Method : Visual check of the bridge solder, which must not be away from the joint.

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  • Structure : Bridge line crooked (crease lines) ( Not allowed )

  • Purpose/Method : Visual check of the bridge lines, which must be symmetrical in angle and length.

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  • Structure : End-piece inclination front view ( +/- 1 degree )

  • Purpose/Method : Visual check of the end-pieces, which must be on horizontal axis.

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  • Structure : Sharp point or edge will NOT cause injury ( Not allowed )

  • Purpose/Method : Visual and hand check of the frame, which must not have any sharp edges.

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  • Assembly : Face Form Uneven or twisted ( Not Allowed )
  • Purpose/Method : It is obtained by laying the frame over the CAD drawing to compare the front curve of the frame

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  • Assembly : Scratches ( Not Allowed )
  • Purpose/Method : Visual check of the frame, which must be free of excessive scratches.

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  • Assembly : Pits or Dents ( Not Allowed )
  • Purpose/Method : Visual check of the frame, which must be free of excessive dust spots/ dents

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  • Assembly : Nosepad arms symmetrical & correct height ( Allow +/- 0.2mm left to right )
  • Purpose/Method : The measurement is taken starting from the center of the horizontal front axis, level with the point on the CAD drawing.

How to check the quality of glasses frame_
  • Assembly : Plastic nosepad height( +/- 0.5 mm from drawing, left and right side within +/- 0.2 mm )
  • Purpose/Method :The measurement is taken from the top of the nosepad to the front of the eyerim.

How to check the quality of sunglasses
  • Assembly : Nosepad upside down ( Not Allowed )
  • Purpose/Method : Visual check to ensure the nosepad is inserted correctly.

  • Assembly : Logo plaque gaps ( Not Allowed )
  • Purpose/Method : Visual check for gaps between the logo plaque and frame parts

How to check the quality of sunglasses frame
  • Assembly :End piece or temple joint not aligned(mismatch) – (Not allowed for misalignment, allow step of less than 0.1 mm )
  • Purpose/Method :Visual check to ensure end-piece and temple joint are aligned properly. Use calipers to check measurement of the step.

How to check the quality of eye glasses frame
How to check the quality of glass frames
  • Assembly : Temple alignment top view ( +/- 2 degrees from CAD )
  • Purpose/Method : Visual check to ensure temples are properly aligned and adjusted per the CAD drawing.

How to check the quality of eye glasses
  • Assembly :Temple deformity (top or side) ( Not Allowed )
  • Assembly : Frame pattern issues on front or temples ( Not Allowed )
  • Assembly :Temple shrinkage or deformity ( Not Allowed )
  • Purpose/Method : Visual check to ensure temples are properly aligned and adjusted per the CAD drawing.

How to check the quality of eye glasses_
How to judge the quality of glasses frame
  • Assembly : Wire core issues ( Allow minor defect )
  • Purpose/Method : Visual check to ensure no discoloration of wire core or misalignment with plastic temple.

How to check the quality of sun glasses frame
  • Assembly : Rocking temple( Allow minor rocking )
  • Purpose/Method : Hand check to ensure the temples do not move excessively at the hinge from side to side. To perform this check, hold the frame in one hand and the open temple in the other hand. Attempt to twist the frame at the hinge and note the amount of movement.

  • Assembly : Flex hinge sticking( Not Allowed )
  • Purpose/Method : Hand check to ensure the hinges do not stick open when flexed.

How to check the quality of sun glass frame
  • Assembly : Stop hinge not working ( Not Allowed )
  • Purpose/Method : Hand check to ensure the stop hinge is functioning properly (tips do not touch the back of the lens when closed)

How to check the quality of sun glasses(1)
  • Assembly  Hinge surface issues ( Not Allowed )
  • Purpose/Method : Visual check to ensure hinge surface is free of debris, oxidation, polish, etc.

How to check the quality of eye glass
  • Assembly:Hinges too tight ( Not Allowed )
  • Purpose/Method : Hand check to ensure the hinges can open and close freely and easily.

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  • Assembly  Tip ends not secure ( Not Allowed )
  • Purpose/Method : Hand check by gently pulling temple tip ends to ensure the temple tips are secure.

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  • Assembly  Internal Polishing Marks ( Not Allowed )
  • Purpose/Method : Visual check for internal polishing marks

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  • Assembly : Top edge polishing marks ( Not Allowed )
  • Purpose/Method : Visual check for polishing marks on the top edge of the frame (front and temples)

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  • Assembly :Polishing Marks near logo ( Not Allowed )
  • Purpose/Method : Visual check for polishing marks on or near logo.

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  • Lens : Lens Scratch or pits/ dots -Refer to A, B, C classification

  • Purpose/Method :Visual check of lenses for defects in the zones.

  • (zone A: 30mm, zone C: 5mm from edge of lens per diagram)

A Zone = Ø 30mm

C Zone = 5mm from the edge

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  • Defects accepted:

DEFECTS IN ZONE A ARE NOT CUMULATIVE

For Mirror / AR / tinted lenses 1 additional white spot of 0.16mm is accepted

A: 1 defect, Black-Spot ≤ 0,120 mm

A: 1 defect, inclusion ≤ 0,25 mm

A: 2 defects, inclusion ≤ 0,22 mm

A: 3 defects, inclusion ≤ 0,18 mm

DEFECTS IN ZONE B ARE NOT CUMULATIVE

For Mirror / AR / tinted lenses 1 additional white spot of 0.25mm is accepted

B: 1 defect, Black-Spot ≤ 0,25 mm

B: 2 defects, inclusion ≤ 0,24 mm

B: 1 defect, Scratch ≤ 2.00 mm

  • Lens : Gradient Axis – ( Gradient color about 2/3 ratio and horizontal. Left and right lens need symmetry. No variance allowed. )

  • Purpose/Method : Visual check to ensure gradient is on axis and symmetrical for right and left sides

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  • Lens : Color difference/ uneven between left and right(Not Allowed)

  • Purpose/Method : Visual check to ensure gradient is on axis and symmetrical for right and left sides

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  • Lens : Polarization Axis(Not Allowed)

  • Purpose/Method : Visual check with polarization tool to ensure axis of polarization is on 180 degree mark using polarization tool

  • Color : Color/ effect different between front and temple (Not Allowed)

  • Purpose/Method : Visual check against Master Sample

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