Overview - EN ISO 8980-1:2017 (Ophthalmic optics)
EN ISO 8980-1:2017 specifies requirements and verification methods for the optical and geometrical properties of uncut finished spectacle lenses, covering both single‑vision and multifocal lenses. Adopted by CEN as a European standard, this fourth edition updates and supersedes the 2004 version and defines how manufacturers and laboratories must measure and declare lens properties used in eyewear production and quality control.
Key topics and technical requirements
- Scope and classification: Defines uncut finished lenses as single‑vision, multifocal and power‑variation finished lenses.
- Reference conditions: Measurements and tolerances apply at a reference temperature of 23 °C ± 5 °C and at specified reference wavelengths (see ISO 7944).
- Optical requirements:
- Verification is performed using a focimeter conforming to ISO 8598‑1.
- Back vertex power, cylindrical power and axis, addition power for multifocals, prismatic power, and prism base setting are specified with tolerances. Tolerances vary by power ranges (tabulated in the standard).
- Addition (ADD) tolerances and measurement points for multifocal segments are defined.
- Geometrical requirements:
- Size and thickness limits for uncut lenses and segment dimensions for multifocals are specified.
- Orientation requirements for polarizing lenses are included.
- Verification and inspection methods:
- Detailed test procedures for each optical parameter (back vertex power, cylinder axis, prismatic power, addition, segment size).
- Inspection method for material and surface quality (informative annex).
- Marking and information:
- Requirements for labeling (e.g., position‑specific single‑vision lenses, polarizing lenses) and accompanying documentation.
Practical applications and users
This standard is essential for:
- Spectacle lens manufacturers - for product design, tolerancing and batch release.
- Optical laboratories and test houses - for inspection, calibration and certification of uncut lenses.
- Dispensing opticians and eyeglass manufacturers - to verify incoming lens specifications before edging and mounting.
- Regulatory and quality managers - to ensure compliance with international tolerances and to reduce returns due to measurement discrepancies.
Practical uses include production quality control, supplier acceptance testing, specification of verification power on packaging, and harmonizing measurement methods across the supply chain.
Related standards
Keywords: EN ISO 8980-1:2017, ophthalmic optics, uncut finished spectacle lenses, single‑vision lenses, multifocal lenses, focimeter, back vertex power, addition power, prismatic power, lens tolerances.
