Overview
EN ISO 8980-5:2005 (ISO 8980-5:2005) is a CEN/ISO standard in the ophthalmic optics family that defines minimum requirements and a test method for spectacle lens surfaces claimed to be abrasion-resistant. It applies to uncut finished spectacle lenses (both front and back surfaces) and establishes a reproducible procedure to verify that a lens surface resists visible abrasion under defined conditions. The standard is intended as a basic acceptance test and does not attempt to quantify abrasion performance beyond the specified criteria.
Key Topics and Requirements
- Scope: Covers spectacle lens surfaces (including coated surfaces) claimed to be abrasion-resistant; test results are applicable across lenses with identical surface properties even if lens power or radius differ.
- Pass criterion: Under the specified test method, the tested surface shall be free of visible abrasion. For type testing, 10 consecutive surfaces must pass.
- Test specimen limits: Lenses with optical power between −3.00 D and +3.00 D and a surface radius of curvature ≥ 75 mm are used for testing.
- Abrasion tool and consumables:
- Tool applies a force of (5 ± 1) N using an eraser wrapped in cheesecloth.
- Eraser: rubber/abrasive mix containing at least 15% pumice, fine ground to pass 45 µm, with hardness IRHD 75 ± 5.
- Cheesecloth: unbleached, folded to 12 layers with specified yarn counts.
- Test cycle: 25 cycles at (1 ± 0.1) cycles/s, stroke length (30 ± 5) mm, centerline within ±2 mm of the geometric centre; tool must follow curvature within ±5°.
- Environmental & inspection conditions:
- Test environment 23 ± 5 °C, 50 ± 20% RH.
- Inspection lighting: fluorescent source ≥ 400 lm, ambient room ~200 lx; inspect by reflection and side illumination.
- Verification & cleanliness: Annex B prescribes site verification (using ADC lenses) to control particulate contamination; mechanization is permitted for repeatability (Annex C).
Applications and Practical Value
- Ensures consistent quality control for manufacturers claiming abrasion-resistant spectacle lenses or coatings.
- Supports product certification, incoming inspection, and type testing for optical labs, lens coating facilities, and eyewear manufacturers.
- Helps optical retailers and specifiers verify that lenses meet minimum abrasion resistance claims before delivery to consumers.
- Provides a standardized, repeatable test useful in R&D when comparing substrate and coating formulations.
Who would use this standard
- Ophthalmic lens manufacturers and coating suppliers
- Quality assurance engineers and laboratory technicians in optics
- Test laboratories and conformity assessment bodies
- Optical laboratories and dispensing opticians evaluating supplier claims
Related standards
- ISO 8980 series (other parts cover specifications for single-vision/multifocal and progressive lenses)
- ISO 8980-4 (anti-reflective coatings test methods)
- ISO 13666 (ophthalmic vocabulary)
- ISO 48 (rubber hardness testing)
Keywords: EN ISO 8980-5:2005, ISO 8980-5, abrasion-resistant spectacle lenses, ophthalmic optics, abrasion test method, spectacle lens surfaces.