EN ISO 8980-2:2017 PDF

Overview

EN ISO 8980-2:2017 - Ophthalmic optics - Uncut finished spectacle lenses - Part 2: Specifications for power-variation lenses - defines optical and geometrical requirements and verification methods for uncut finished power‑variation spectacle lenses. Published by CEN as an adoption of ISO 8980-2:2017, the standard sets tolerances, test procedures and marking/identification rules used in manufacturing, inspection and conformity assessment of lenses whose power varies across the surface (e.g., progressive or other power‑variation lenses).

Key topics and technical requirements

• Scope & classification: Covers uncut finished lenses and classifies finished lenses into single‑vision, multifocal and power‑variation types.
• Reference conditions: Tolerances apply at 23 °C ± 5 °C and at specified reference wavelengths.
• Optical verification: Measurements must use a focimeter conforming to ISO 8598‑1; optical tolerances are applied at defined reference points.
• Power tolerances: Specifies tolerances on back‑vertex power and cylindrical power that vary by power range (many common ranges use ±0.12 D; tolerances increase for higher dioptric values).
• Cylinder axis: Axis tolerance depends on cylindrical power (for cylinder ≥0.12 D axis tolerances range from ±14° down to ±2° as power increases).
• Variation (addition) power: Tolerance for variation/addition power is specified (example: ≤4.00 D → ±0.12 D; >4.00 D → ±0.18 D).
• Prismatic power & reference point: Defines how to verify total prism (including ordered and thickness‑reduction prism) and applicable tolerances.
• Geometrical and material checks: Requirements for size, thickness, polarizing orientation, surface/material quality, marking and information on packaging.
• Verification methods: Detailed procedures are in Clauses 6.x for back‑vertex power, cylinder axis, prism, variation/addition power and surface inspection.

Practical applications

• Quality control and acceptance testing in spectacle lens manufacturing
• Incoming inspection for laboratory and distribution centers
• Compliance and conformity assessment to meet EU/CEN or national requirements
• Procurement specifications for optical labs, retailers and healthcare providers
• R&D and product development for progressive/power‑variation lens designs

Who should use this standard

• Lens manufacturers and optical laboratories
• Optometrists and ophthalmic dispensers involved in lens verification
• Regulatory bodies, conformity assessment bodies and procurement teams
• Product managers and R&D engineers in ophthalmic optics

Related standards

• ISO 7944 (reference wavelengths)
• ISO 8598‑1 (focimeters)
• ISO 8980‑3 (transmittance specs and tests)
• ISO 13666, ISO 14889, ISO 21987 (vocabulary, fundamental requirements, mounted lenses)

Keywords: EN ISO 8980-2:2017, ophthalmic optics, uncut finished spectacle lenses, power‑variation lenses, tolerances, verification methods, focimeter, back‑vertex power, cylinder axis.