01
What lenses does XinXin manufacture?
Custom plano lenses for sunglasses, sports eyewear, goggles, and protective eyewear for brands, private labels, and product teams.
Custom Sunglass & Goggle Lens Manufacturer in China
OEM/ODM Lens Development for Eyewear Brands — From Specification and Sampling to Volume Production.
XinXin is a Shenzhen lens factory serving eyewear brands, private labels and product teams since 2012. We develop Nylon, PC, TAC and CR-39 lens solutions with polarization, photochromic and contrast-enhancing (Hi-Con) functions, mirror coatings, and custom tinting. Custom programs start at 300 pairs per specification, with finished-lens testing defined by the agreed specification and target market.
- Nylon / PC / TAC / CR-39
- Polarized / Photochromic / Hi-Con
- Tint / Mirror / HC / AR / Anti-Fog
- Custom Curves & Colors
- 300 Pairs / Specification
- Finished-Lens Testing
Custom Lens Manufacturing
Custom Lens Manufacturing
XinXin helps eyewear brands evaluate lens materials, customization options, MOQ, testing requirements, and the path from a lens brief to volume production.
02
Which lens materials are available?
Nylon/polyamide, PC, TAC polarized laminate, and CR-39. The material or structure is selected according to the application, curve, frame construction, and optical targets.
03
What can be customized?
Lens outline, base curve, thickness, color, VLT/CAT target, polarization, photochromic and contrast-enhancing functions, mirror, hard, AR, and anti-fog coatings.
04
What is the MOQ?
Custom production starts at 300 pairs per specification. Final MOQ may vary by material, color, function, coating, and lens construction.
05
What is needed for a quote?
For an accurate quote, provide the application, target market, drawing or sample, dimensions, material, color/VLT, functions, coatings, quantity, and testing requirements.
06
How does a custom lens project proceed?
Specification review, material and process selection, sample development, finished-lens testing and approval, followed by volume production.
Lens Material Options
Lens Product Materials and Structures
Different material and structure options suit different curves, weights, functional combinations, and use cases. Final results are confirmed by the specified finished-lens structure, process, and testing.
PC
PC Lens (Polycarbonate Lens)
Complex Curves and Protective Structures
- A thermoplastic polycarbonate lens substrate for complex curves, wraparound forms, and sports applications.
- Can be combined with polarization, tinting, photochromic, mirror, and other surface treatments.
- Impact resistance, optical quality, UV performance, coatings, and finished-product protection are verified on the specified finished lens.
Goggles, protective eyewear, sports eyewear, and lenses requiring impact-resistance evaluation.
PA
Nylon / Polyamide Lens
Lightweight and Wraparound Curves
- A polyamide lens substrate for lightweight, curved, and wraparound lenses.
- Can be combined with polarization, photochromic, high-contrast, tinting, and surface treatments.
- The specific grade, moisture condition, thermal history, stress, coating, and finished-product results must be confirmed separately.
Lightweight sunglasses, sports eyewear, and selected polarized/photochromic lens products.
TAC
TAC / Polarized Laminate
Composite Structure and Directional Glare Control
- A composite structure made from TAC sheets, polarizing elements, protective/support layers, and adhesive layers.
- Suitable for polarized sunglasses and lenses requiring controlled layer sequence, axis, and edge sealing.
- TAC itself does not create polarization; polarization, spectral performance, and interlayer reliability are verified on the finished product.
Polarized sunglasses, outdoor lenses, and composite/laminated lenses.
CR-39
CR-39 Lens
Cast Resin and Optical Appearance
- A thermoset cast/polymerized lens route based on ADC resin systems.
- Suitable for selected sunglasses, tinted lenses, gradient lenses, and optical appearance designs.
- The resin system, casting process, curvature, coatings, and finished-product optical performance must be confirmed separately.
Plano sunglasses, tinted lenses, and products focused on appearance and optical performance.
Materials are a starting point for selection. They do not by themselves indicate polarization, UV protection, VLT, CAT, impact resistance, abrasion resistance, or certification. Final specifications are based on the specified finished-product structure, process, testing, and target-market requirements.
Core Optical Lens Functions
Core optical functions change visible-light transmission, ultraviolet transmission, polarization state, environmental response, or task-specific spectral transmission; actual results depend on the finished structure, use conditions, and verification.
Solar Filtering
Manage overall visible-light transmission in bright environments
- Reduce the amount of visible light entering the eye through absorption, tinting, selective transmission, reflection, or combined structures
- Primarily manages overall brightness; it is not the same as polarization, UV protection, or a mirror appearance
- Gray, brown, green, colored, and gradient transmission schemes produce different visual tints and brightness distributions
- VLT, CAT, color, and UV transmission must be confirmed separately for the specific finished product
PC / Nylon / TAC / CR-39 / Glass, depending on the transmission target, structure, and finished-product requirements
UV Protection (UV Filtering)
Reduce ultraviolet transmission through the finished lens
- Reduce UVA and UVB transmission through the substrate, additives, tinting, coatings, or a combination of these structures
- UV protection is not the same function as visible-light darkness, color, polarization, or mirror appearance
- Writing UV400 or a specific transmission claim requires corresponding test conditions and finished-product evidence
- A light or transparent appearance can still provide UV filtering, but color alone cannot determine it
Determined by the substrate, additives, tinting, and coating combination; verify with finished-product UV testing
Polarization
Selectively attenuate reflected glare with a specific polarization direction
- A polarizing component selectively attenuates light with a particular polarization direction and is commonly used for reflected glare from water, roads, and snow
- It can reduce glare interference and improve visual comfort, but it does not eliminate all strong light or all reflections
- Polarization efficiency, axis, transmittance, and color must be confirmed for the specific component and finished product
- Polarization is not the same as UV protection, dark tinting, or mirror reflection; these options can be combined
Polarizing film / polarizing sheet component + PC / Nylon / TAC / CR-39 carrier structures; verify on the finished product
Photochromic
Change lens transmission with changing light conditions
- A photochromic system darkens when activated by ultraviolet and/or specified spectral exposure, then gradually lightens as the stimulus decreases
- Transition speed, final darkness, temperature dependence, and indoor behavior depend on the formulation, substrate, coating, structure, and environment
- Useful when moving between different light conditions and reducing lens changes, but a fixed CAT or transition speed is not a universal conclusion
- Response inside a vehicle, in low-UV environments, or at low or high temperatures may differ from outdoor behavior at moderate temperature
Photochromic system + PC / Nylon / CR-39 carrier structures; confirm with formulation-specific finished-product testing
Blue-Light Filtering
Adjust visible-light transmission by target wavelength bands
- Selectively attenuate or retain parts of the visible spectrum through material absorption, tinting, coatings, or composite structures
- Blue-light filtering is a target-band design; blocking ratio, wavelength range, overall color cast, and transmittance require specific confirmation
- It can support color management, glare or visual-comfort design, and selected work or sports applications, but a ‘blue-light blocking’ label alone does not establish a health effect
- Selective transmission changes spectral composition; it is not the same as increasing optical resolution
PC / Nylon / TAC / CR-39 / Glass structures with a defined spectral design; select by spectrum and finished-product validation
High Contrast (Hi-Con)
Improve separation between target and background in selected conditions
- Change the spectrum reaching the eye through selective transmission so that a target can be more distinct from its background under selected conditions
- Yellow, orange, pink, or brown bases may suit different conditions, but a color name alone does not prove contrast improvement
- The result depends on illumination, background, target color, the wearer's vision, and the specific spectral curve
- High contrast improves target recognition or separation under selected conditions; it is not the same as increasing geometric resolution or Abbe value
PC / Nylon / TAC / CR-39 structures with a defined spectral design; material name alone does not determine contrast performance
Solar filtering manages overall visible light; UV function manages ultraviolet transmission; polarization addresses reflected glare from particular directions; photochromic systems respond to light exposure; selective transmission and high contrast manage specific spectral bands. VLT, CAT, UV transmission, polarization efficiency, spectral curves, and visual results must be treated as finished-product verification targets.
Surface Treatment
Surface Treatment Functions
Surface treatment functions change how the lens surface interacts with light, contaminants, wiping, and warm humid environments; actual results depend on the coating system, use conditions, and verification.
HC
Hard Coating (HC)
Abrasion resistance for defined lens systems and test methods
- Protects against scratches from wiping, dust, assembly, and transport
- Pencil hardness and steel-wool tests describe the agreed method, not the whole lens
- Verified per coating system and substrate, including adhesion and compatibility with later coatings
- Not proof of impact resistance, UV, or polarization
PC / Nylon / TAC / CR-39 and other plastic substrates with subsequent coating systems; confirmed by coating system, curing conditions, and finished-product abrasion testing.
AR
Anti-Reflective Coating (AR)
Reduces surface reflection within defined wavelengths, angles, and sides
- Thin-film interference reduces reflected light, improving transmission and appearance
- Performance varies with wavelength, angle, coated side, and substrate
- Single-layer and multi-layer designs both possible; layer count alone is not performance
- Residual reflection and transmission confirmed under agreed lighting and viewing
Single-side or double-side AR, outer mirror with inner AR, or AR with an easy-clean top coat; verified by finished-product transmittance and reflectance spectra and appearance references.
MIRROR
Mirror / Flash Coating
Reflective appearance within the finished-product transmission and reflection relationship
- Outer-side metals, oxides, or dielectrics create the reflective appearance
- Mirror color varies with lens, curvature, light source, and viewing angle
- Mirror appearance cannot replace wearer-side VLT, CAT, UV, or polarization tests
- 'Stronger mirror = darker' and 'mirror = CAT 3-4' are incomplete assumptions
Combined with solar filtering, polarization, photochromic and other functions, and base-lens colors; verified by reference samples, finished-product transmittance and reflectance spectra, and coating reliability.
H/O
Hydrophobic & Oleophobic (H/O)
Outermost easy-clean top coat that reduces water marks and fingerprints
- Lowers surface energy so water and oily soils wipe off more easily
- Contact angle is one metric under defined conditions, not standalone proof of durability
- Results depend on soil type, wiping, and history; retest after abrasion and aging
- Not a waterproof or permanent anti-soiling layer
Usually applied as the outermost layer over AR, HC, or other compatible layers; verified by coating system and by retention after abrasion and aging cycles.
AF
Anti-Fog Coating (AF)
Delays or reduces visible fogging under defined fogging conditions
- Changes whether condensate forms droplets or a continuous film
- Results depend on temperature, humidity, airflow, and fit
- Cannot replace whole-eyewear design; ventilation and double layers are verified separately
- Anti-fog (hydrophilic) and hydrophobic mechanisms can be opposites
Goggle and protective-eyewear systems, and combinations with HC, AR, or top coats; verified by fogging conditions, cleaning and abrasion cycling, and whole-eyewear testing.
HC manages abrasion resistance; AR manages surface reflection; mirror and flash manage reflective appearance; H/O manages the cleaning experience; AF manages fogging under defined conditions. Polarization, UV, CAT, and impact resistance are never implied by a coating name and must be verified on the finished product.
Lens Color & Appearance Options
Color and appearance options define the transmitted or reflected look of the finished lens: a single color or transmission target, a spatial distribution, a clear or high-transmission state, or a reflective mirror and flash face. They belong to the product-combination dimension rather than the core-function level. Color, mirror, or gradient alone cannot prove UV protection, VLT, CAT, polarization, or driving suitability; each result must be confirmed on the finished product with agreed test conditions and market documentation.
Solid Tint / Tinting
A single color or transmission target over the whole lens area
- A uniform color or transmission target is defined over the lens area, realized by in-body coloring, tinting, dyeing, or absorbing structures
- Shade or color is not the same as a visible-light transmittance value; a color name alone never sets VLT
- Claims such as a certain color being safer or always improving contrast are not general conclusions; confirm with finished-lens spectra, VLT, reference samples, and agreed light source and viewing conditions
- A solid tint does not prove polarization, UV, CAT, or durability; when combined with solar filtering, polarization, or other functions, every result is verified separately on the finished lens
In-body coloring, tinting, or absorbing layers on the chosen substrate; confirmed with the target color, reference samples, and finished-lens VLT and transmission spectrum
Gradient Tint / Gradient Transmission
A spatial distribution of color or transmission target across the lens area
- Distribution direction, transition, start and end positions, and curved-surface mapping are defined by drawings, reference samples, and measuring points
- Forming, edging, or centering changes the physical and geometric mapping of a distribution; a flat blank cannot represent the final gradient on a formed finished lens
- A gradient describes the distribution appearance; it does not by itself provide polarization, UV protection, CAT classification, or driving suitability
- When combined with solar filtering, polarization, high contrast, or photochromism, each function is verified separately on the finished lens
Gradient dyeing, tinting, or absorbing structure on a base substrate; the final distribution is defined by drawings, reference samples, and agreed measuring points
Clear / High Transmission
A visible-light transmission target or appearance state
- Clear does not mean no function: UV filtering, selective spectral transmission, anti-reflective coating, or photochromic systems can still be present in a clear or lightly tinted lens
- Visible-light transmittance and UV filtering are independent; a clear appearance neither proves the absence of UV nor fixes a single VLT value
- Clear or high-transmission serves a transparent appearance or light-weight target and does not prescribe a color
- Transmission spectrum, color cast, and reference samples are confirmed under agreed illumination and measurement conditions
Clear base substrate with optional UV, anti-reflection, selective, or photochromic structures; confirmed by the transmission spectrum, color cast, and reference samples
Mirror / Flash Appearance
A reflective outer appearance formed by the coated side
- The outer reflective color mainly comes from reflected light, while the wearer sees brightness and color mainly from the transmitted light
- The outer reflection color cannot replace the wearer-side transmitted color or a VLT measurement
- A stronger mirror does not automatically mean more shading or a fixed CAT 3-4 category
- Coating side, reflection spectrum, base tint, and reliability are confirmed separately on the finished lens
Reflective coating stack on the outer side of a tinted or mirror base; confirmed with the reflection spectrum and coating reliability
Solid tint defines the color and transmission target of the whole lens; gradient or gradient distribution maps a different color or transmission across the lens; clear or high-transmission serves a transparent or high-transmission appearance; mirror or flash creates a reflective outer look. Color, mirror, and gradient cannot be used to infer UV, VLT, CAT, polarization, driving suitability, or durability; every claimed combination must be defined and tested on the finished lens.
Application Scenarios
Lens Application Scenarios
Different scenarios have significantly different lens requirements. Understanding scenario-based classification helps precise product selection and customer communication.
CAT 2~3
Driving
Clear vision with controlled glare
- Polarized lenses help reduce glare from reflective road surfaces
- CAT 2–3 is a common daytime starting point
- Gray and brown tints suit everyday daytime driving
- Night use requires a suitable VLT and spectral target
Lens: Polarized (Gray/Brown)
Material: TAC (cost-effective), Nylon (premium)
CAT 2~3
Outdoor Sports
Lightweight optics for changing outdoor conditions
- Hi-Con and polarized options suit different outdoor activities
- Tint and VLT can be tuned for changing light conditions
- Nylon and PC suit lightweight sports eyewear designs
- Curvature and fit should match the frame design
Lens: Hi-Con (High Contrast), Polarized
Material: Nylon (lightweight/premium), PC (value/impact-focused)
CAT 3
Water Sports
Reduce surface glare around water
- Polarized lenses help reduce glare from the water surface
- Blue and contrast tints suit different water conditions
- CAT 3 is a common outdoor starting point
- Suitable for fishing, sailing, and rowing concepts
Lens: Polarized (Blue optional)
Material: TAC (cost-effective polarized), Nylon (premium/lightweight)
CAT 3~4
Snow & Alpine
High-coverage optics for bright reflective environments
- Darker transmission targets suit intense reflected light
- Mirror coatings add reflective appearance and light control
- CAT 3–4 can be evaluated for the intended market
- Wraparound curves support high-coverage frame designs
Lens: CAT 3–4 with Mirror option
Material: Nylon (premium/curved), PC (value/impact-focused)
CAT 3
Fishing
Polarized vision for glare across the water
- Polarization helps reduce glare from the water surface
- Lens color can be tuned to the fishing environment
- Gray, brown, and contrast tints are common options
- Hi-Con tints support target-background separation
Lens: Polarized (Blue optional)
Material: Nylon (premium/lightweight), TAC (cost-effective polarized)
CAT 2~3
Golf
Contrast-focused optics for changing course conditions
- Hi-Con tints support target-background separation
- Orange, pink, brown, and green options suit different light
- Lighter transmission supports changing outdoor conditions
- Nylon keeps the lens lightweight during extended wear
Lens: Hi-Con (Orange/Pink)
Material: Nylon (premium/lightweight), PC (value/impact-focused)
CAT 2~3
Running & Fitness
Lightweight lenses for active daily movement
- Nylon and PC support lightweight sports designs
- Polarization helps reduce glare on outdoor routes
- Orange and yellow tints suit lower-light conditions
- Frame fit and lens retention support active use
Lens: Polarized, Hi-Con
Material: Nylon (lightest/premium), PC (value/impact-focused)
CAT 2~3
Motorcycling
Wraparound coverage for fast-moving outdoor use
- High-base curves suit close-fitting riding designs
- Polarized lenses help reduce glare from selected surfaces
- Surface treatments support easier cleaning in dusty conditions
- CAT 2–3 is a common starting point for daytime use
Lens: Polarized (High Base 6+)
Material: PC (impact-focused), Nylon (lightweight/premium)
CAT 1~2
Fashion & Daily
Appearance-led color and lens combinations
- Solid, gradient, and mirror options support varied styling
- CAT 1–2 suits lighter everyday tint concepts
- Polarized and non-polarized constructions are available
- Color and VLT can be matched to the frame concept
Lens: Fashion Tint, Polarized optional
Material: CR-39 (optical/value), Nylon (lightweight/premium), PC (impact-focused)
CAT 1
Computer & Phone Use
Clear and light-tint options for indoor screens
- Blue-light filtering targets defined wavelength bands
- Clear and light-yellow options suit indoor use
- Light transmission can match the screen environment
- Switch to an outdoor lens for bright exterior conditions
Lens: Blue-Light Filtering
Material: TAC (cost-effective), Nylon (versatile/premium)
CAT 2~3
Children's Eyewear
Lightweight, impact-focused eyewear designs
- PC is a common impact-resistant lens option
- Lightweight construction supports everyday wearing comfort
- Bright colors and simple tints suit children's designs
- Material and testing follow target-market requirements
Lens: PC Safety Lens
Material: PC (impact-focused/value)
CAT 2~3
Presbyopia & 40+
Prescription lens programs for far and near vision
- Progressive designs combine distance and near vision zones
- High-prescription options require a separate design review
- Material choice depends on prescription and lens geometry
- Confirm prescription and fitting requirements before development
Lens: Prescription / Progressive
Material: Subject to prescription review
Driving: Polarized CAT 2–3 · Water/Fishing: Polarized · Sports/Outdoor: Hi-Con or Polarized · Snow/Alpine: CAT 3–4 + Mirror · Fashion/Daily: CAT 1–2 · Children: PC impact-focused. Final specifications depend on the finished lens, intended use, and target market.
Lens Manufacturing Processes
Starting with material and structure definition, plano lenses for sunglasses, sports eyewear, goggles, and protective eyewear are produced through forming, lamination, tinting, coating, and finishing. The applicable process route depends on the lens material, function, curvature, thickness, frame structure, and target-market requirements.
01
Injection Molding
Thermoplastic lens materials such as PC and selected PA grades, with applications in sports eyewear, goggles, and protective eyewear.
Injection molding can form complex curves and wraparound structures when the material, mold, and equipment are properly matched. Material condition, mold design, injection, packing, and cooling affect lens dimensions, curvature, warpage, surface condition, and residual stress.
- Curvature
- Thickness
- Dimensions
- Appearance
- Stress condition
- Surface treatment
- Finished-lens impact performance
02
Lamination
Composite lenses made from TAC, polarizing elements, protective layers, support layers, and adhesive layers, commonly used for polarized sunglasses.
Lamination combines multiple functional layers into an integrated structure. Key controls include layer sequence, alignment, polarizing axis, interface cleanliness, adhesive layer, and edge sealing.
- Bubbles
- Wrinkles
- Edge condition
- Interlayer bonding
- Polarization direction
- Environmental durability
- Color and transmission performance
03
Thermoforming
Sheets or laminated semi-finished parts that have been validated for thermoforming. Common applications include wraparound sunglasses, sports eyewear, and goggle structures.
Heating, mold forming, and controlled cooling create the target curve. Thermoforming may affect curvature, thickness, polarizing axis, optical performance, interlayer stress, and edge condition.
- Curvature
- Thickness
- Assembly fit
- Edge integrity
- Optical quality
- Left-right consistency
- Polarization performance
04
Casting and Polymerization
Resin systems such as CR-39, commonly used for sunglasses, tinted lenses, and gradient lenses.
Resin preparation, filtration, degassing, injection into the mold, polymerization, curing, and cooling jointly determine the lens forming quality.
- Color
- Bubbles
- Particles
- Curvature
- Dimensions
- Internal defects
- Surface condition
- Suitability for subsequent coating
05
Tinting and Gradient Tinting
Creating solid colors, gradients, and target transmission effects. Depending on the material and product structure, routes may include mass coloring, dip tinting, or gradient dip tinting.
The selected tinting route must be matched to the lens material, target appearance, transmission requirement, and subsequent coating process.
- Color
- Color stability
- Color difference
- Gradient transition
- Left-right consistency
- VLT (Visible Light Transmittance)
- Compatibility between tinting and subsequent coating
06
Coating and Surface Treatment
Product designs that require hard coating, anti-reflective coating, mirror coating, hydrophobic and oleophobic treatment, or anti-fog treatment.
Different coatings address different requirements: hard coating focuses on abrasion resistance; anti-reflective coating focuses on transmission and reflection performance; mirror coating focuses on reflective appearance and spectral behavior; hydrophobic and oleophobic treatments focus on wetting and cleaning; anti-fog treatment focuses on fogging control under specified conditions.
- Adhesion
- Appearance
- Coating system
- Treated surface
- Surface preparation
- Abrasion resistance
- Substrate and curvature
- Environmental durability
- Transmission and reflection
07
Cutting, Grinding, and Cleaning
Forming the lens outline, edges, and surface condition required for assembly. This route may apply to glass, sheets, and lens blanks.
The finishing route prepares the lens geometry and surface condition for accurate assembly while protecting the finished lens from edge and surface defects.
- Curvature
- Thickness
- Scratches
- Dimensions
- Cleanliness
- Edge chipping
- Edge integrity
- Clamping condition
- Fit with the frame
Confirmation of Process Results: Material names and process names do not by themselves represent fixed UV performance, VLT, CAT, polarization, impact resistance, abrasion resistance, or certification status. Final performance depends on the specific material or component, lens structure, curvature, thickness, surface treatment, processing conditions, and complete finished-lens testing.
Optical Specifications
Lens Optical Specifications & Verification
Optical specifications define the transmission, protective performance, curvature, and finished-lens visual quality requirements for plano sunglass, sports eyewear, goggle, and protective eyewear lenses. Every value is tied to a specific model, lens construction, sample condition, test method, test conditions, and target-market standard.
VLT · CAT 0–4
Visible Light Transmittance & Filter Category
VLT defines lens darkness — confirmed by measurement, not by eye.
- VLT describes the percentage of visible light transmitted under a specified method; the lower the value, the darker the lens
- CAT is a transmittance classification in certain standards (e.g., CAT 0–4); some markets require it on the label
- VLT/CAT values, label wording, and use restrictions are confirmed against the target-market standard and the finished-lens transmittance spectrum
- Lens darkness cannot be judged by eye; it must be confirmed by spectral measurement of the finished lens
- Lock in the transmittance specification for lens darkness and target-market labeling before sampling and quoting
Test: Spectral measurement of the finished lens
Standard: Target-market standard & label wording
UV400
UV Transmission
UV filtration depends on the substrate, tinting, polarization, and coatings.
- UV transmission describes how much ultraviolet radiation passes through the finished lens. It is affected by the substrate, tinting, polarizing construction, and coatings
- Light-colored lenses can still provide UV filtration
- UV transmission is confirmed by standard methods and finished-lens testing; "UV400" or similar claims may be used only when supported by corresponding test data
- Material names, colors, or a "UV400" mark cannot replace test results for the specified lens
- Confirm whether "UV400" can be used on the label; this determines the product claim and the supporting UV compliance documentation for the target market
Test: Standard UV transmission test on the finished lens
Standard: Target-market claim & compliance documentation
Polarized
Polarization
Polarization comes from the laminated structure, not the material name.
- Polarization performance comes from the oriented polarizing element, polarization axis, and complete laminate structure—not from a material name
- Polarization axis, efficiency, and the VLT and color of polarized lenses are confirmed on the finished lens
- Viewing digital displays, distinguishing colors, and other usage requirements are assessed against the intended use cases
- Polarization is not the same as a dark lens or UV protection; the three can be combined and must be confirmed separately
- Confirm the polarization application and intended scenarios (driving, water sports, and snow sports) to define the sample verification requirements
Test: Polarization efficiency & axis measurement on the finished lens
Standard: Use cases: driving / water sports / snow sports
Base Curve
Base Curve, Thickness & Dimensions
Base curve defines the curvature design — not the wrap or lens angle.
- Base Curve describes the lens curvature design, commonly specified by nominal base power or design curvature; it is not the same as a wrap angle or lens angle
- Base curve, wrap angle, thickness, outline, frame construction, and mounting jointly affect appearance, fit, assembly stress, and off-axis visual performance
- Design curvature, center and edge thickness, outline dimensions, tolerances, and post-assembly condition are confirmed against drawings, measurement points, and tolerances
- There is no universal diameter or thickness that fits all lenses
- Use this assessment to determine whether the lens fits the target frame and to define the development approach
Test: Drawings, measurement points & tolerances
Standard: Frame fit & assembly condition check
Index · Abbe
Refractive Index & Abbe Number
Index and Abbe data compare materials for lens-curve design.
- Refractive Index and Abbe Number are optical data of a material or grade, used for material comparison and lens-curve design evaluation
- Refractive index, together with curvature, thickness, and viewing angle, affects light propagation; Abbe Number describes the material's dispersion
- Data must be tied to the actual grade, source, test conditions, and its relationship to the finished-lens construction
- A higher refractive index or Abbe Number alone does not guarantee a clearer or thinner finished lens, or freedom from stress-related optical effects; finished-lens performance must be verified on the actual model
- Use these comparisons to evaluate material routes (nylon, PC, CR-39, and TAC laminate) and confirm the applicable grades and data sources
Test: Material grade data sheets & source records
Standard: Nylon / PC / CR-39 / TAC laminate routes
Stress Check
Stress Birefringence & Optical Wavefront
Processing and assembly stress can distort the optical wavefront.
- Forming, thermal bending, cooling, edging, and assembly can introduce residual stress, causing stress birefringence, phase retardation, or local optical irregularities in polymer lenses
- Curvature errors, thickness variation, and assembly loads also affect final visual performance
- Stress state and optical wavefront are verified by polarized-light inspection, phase-retardation and wavefront checks, appearance inspection, and post-assembly re-measurement
- Acceptance decisions must be based on specified limits, test methods, and sample conditions
- These checks confirm mass-production optical quality and batch consistency, helping reduce customer complaints after assembly
Test: Polarized-light & wavefront inspection
Standard: Specified limits & batch acceptance criteria
Material, color, coating, or process names do not by themselves represent a lens's UV, VLT, CAT, polarization, impact resistance, abrasion resistance, or market compliance; actual performance depends on the specific material, construction, thickness, curvature, surface treatment, processing, and assembly condition. Specifications and acceptance criteria must be based on mutually approved samples, drawings or BOM, test methods, standards, test reports, and batch information. Test data and reports support contract specifications, inspection, and market-compliance documentation.
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