Eyewear Geometry Lab
Frame Sizing and Fit
Frame Index Calculator
Calculate the average of lens width, bridge width, and temple length to classify frame size (S/M/L).
Lens Area Ratio
Analyze lens surface area relative to frame outline for optical balance and aesthetic weight.
Pantoscopic & Face Form Angles
Compute the vertical and horizontal tilt of eyewear frames to optimize fitting and lens alignment.
Frame PD Calculator
Calculate frame center distance (lens width + bridge width) and compare with wearer’s pupillary distance.
Frame Fit Index
Assess how well a frame fits based on head width, bridge width, and temple spread angles.
Temple Spread Angle
Estimate temple opening angle to balance tension and comfort for different head shapes.
Golden Ratio Check
Evaluate whether your frame’s width-to-height ratio aligns with the golden ratio (1.618).
Lens Effective Diameter (ED)
Determine the maximum diagonal of a lens shape — critical for lens blank selection.
Eyewear Frame Manufacturing
Acetate Frame
Calculate how many pieces acetate front could be cut from particular acetate sheet.
Acetate Temple Calculator
Calculate how many pair acetate temples could be cut from particular acetate sheet.
Eyewear Frame Inspection
Eyewear AQL
Simulate eyewear inspections, track defects, and visualize sample results interactively.
Global Eyewear Standards & Compliance
At Shim Sight Eyewear, our engineering philosophy is rooted not only in innovation but also in adhering to the world's most rigorous eyewear manufacturing standards. The reference table below outlines key benchmarks across major markets, ensuring that every ShimSight product meets the highest levels of quality, safety, and performance.
| Region | Standard Code | Standard Name | Scope | Key Requirements Summary |
|---|---|---|---|---|
| International | ISO 12870 | Ophthalmic optics — Spectacle frames — General requirements and test methods | Metal, Plastic Frames | Dimensional stability, corrosion resistance, flammability, mechanical strength |
| International | ISO 8980-1 | Ophthalmic optics — Uncut finished spectacle lenses — Part 1: Specifications for single-vision and multifocal lenses | Prescription Lenses | Refractive power, prismatic power, material and surface quality, transmittance |
| United States | ANSI Z80.1 | Ophthalmic Optics - Prescription Lenses | Prescription Lenses | Optical properties, physical properties, refractive power tolerances |
| United States | ANSI Z80.3 | Nonprescription Sunglass and Fashion Eyewear | Sunglasses, Fashion Eyewear | UV protection, refractive power, impact resistance, flammability |
| European Unio | EN ISO 8624 | Spectacle Frames Measuring System and Terminology | Frames | Measuring system for spectacle frames and related terminology. It is applicable to fronts which are intended to be symmetrical. |
| European Union | EN 1836 | Personal eye protection - Sunglasses and sunglare filters | Sunglasses | UV protection, transmittance requirements, strength, labeling |
| European Union | EN 14139 | Ophthalmic optics - Spectacle frames - General requirements and test methods | Frames | Biocompatibility, nickel release, mechanical properties |
| European Union | EN ISO 14889 | Ophthalmic optics - Spectacle lenses - Fundamental requirements for uncut finished lenses | Prescription Lenses | Material specifications, optical properties, durability and marking |
| Australia/New Zealand | AS/NZS 1067 | Eye and face protection - Sunglasses and fashion spectacles | Sunglasses, Fashion Eyewear | UVR requirements, luminous transmittance, refractive error, robustness |
| China | GB 10810.1 | Spectacle lenses - Part 1: Single-vision and multifocal lenses | Prescription Lenses | Refractive and prismatic power tolerances, material and surface quality |
| China | GB/T 14214 | Spectacle frames - General requirements and test methods | Frames | Mechanical stability, appearance quality, nickel release |
| Japan | JIS T 7331 | Spectacle frames - General requirements and test methods | Frames | Similar to ISO 12870, with specific national amendments |
| Japan | JIS T 7315 | Ophthalmic lenses - Uncut finished spectacle lenses | Prescription Lenses | Quality and performance specifications for finished lenses |