EN ISO 8980-5:2005 PDF

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.