Name: ISO 8980-5:2005 — Ophthalmic optics — Uncut finished spectacle lenses — Part 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistant
SKU: ISO 8980-5:2005
Price: 14400 RUB
Availability: InStock

Overview

ISO 8980-5:2005 - Ophthalmic optics - Uncut finished spectacle lenses - Part 5 specifies minimum requirements and a test method for spectacle lens surfaces claimed to be abrasion-resistant. The standard covers both uncoated and coated lens surfaces and requires that abrasion-resistance claims apply to both front and back surfaces. It defines a repeatable laboratory abrasion test and acceptance criteria for a basic level of abrasion resistance; it does not attempt to characterize performance beyond those minimum criteria.

Key topics and technical requirements

Scope: Applies to uncut finished spectacle lenses and lens surfaces claimed to be abrasion-resistant. Test results are applicable to lenses with identical properties except lens power or surface radius.
Test specimen limits: Lens optical power between −3.00 D and +3.00 D; surface radius of curvature ≥ 75 mm.
Acceptance criterion: Under the prescribed test conditions the tested surface shall be free of visible abrasion. For type testing, 10 consecutive surfaces must pass.
Abrasion test method:
- Abrasion tool applies (5 ± 1) N normal force using an eraser wrapped in cheesecloth.
- Test consists of 25 cycles (one cycle = forward stroke + return stroke) at 1 ± 0.1 cycles/s.
- Stroke length (30 ± 5) mm; abrasion track centre within ± 2 mm of geometric centre.
- Tool must follow curvature within ± 5° of surface normal.
Eraser and cloth specifications:
- Eraser contains ≥ 15% pumice, fine-ground abrasive (100%

ISO 8980-5:2005

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Abstract

Overview

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