SIST EN ISO 11380:2000

Overview

SIST EN ISO 11380:2000 specifies the characteristics and dimensional requirements for formers used in the lens edging process of ophthalmic optics, particularly for the manufacture of spectacle lenses. These formers are essential components used in edging machines to shape lenses for seamless insertion into spectacle frames. The standard ensures consistency in the size, shape, and marking of formers, which contributes significantly to the precision and quality of finished eyewear products. This standard, approved by CEN and aligned with ISO 11380:1994, is a critical reference for manufacturers and professionals involved in optical segment fabrication and lens fitting.

Key Topics

• Scope and Purpose
  SIST EN ISO 11380:2000 applies to formers used in the primary process of edging lenses for spectacle frames. The standard does not cover additional or separate formers used for supplementary treatments (e.g., facetting).

• Types of Formers

  • Lens Size Formers: Match the size and shape of the final spectacle lens, used for specific frame styles or ranges.
  • Aperture Size Formers: Slightly smaller than the final lens, accommodating the space required for the lens bevel.

• Dimensional Requirements

  • Strict tolerance levels ensure the former fits the frame aperture firmly without distorting the rim or leaving discernible gaps.
  • Dimensional differences between formers of the same nominal size and shape must not exceed 0.2 mm at any point on the circumference.

• Marking Guidelines

  • Every former must be marked for manufacturer or supplier identification and model reference.
  • Indication of the nasal side and, where applicable, the boxed lens size in millimeters.
  • Optional centerline and vertical axis marks, if present, must adhere strictly to defined tolerances.

Applications

• Spectacle Lens Production
  This standard is vital for eyewear laboratories and manufacturers using edging machines for mass production or custom lens shaping, guaranteeing interoperability with spectacle frames and reliable fit.

• Quality Assurance in Ophthalmic Optics
  Application of SIST EN ISO 11380:2000 supports high-precision edging processes, reducing rejects due to misfitting lenses and supporting the traceability of the manufacturing process through standardized markings.

• Product Development
  Ensures that newly designed spectacle frame and lens products remain compatible with industry-standard formers, facilitating easier scalability and product interchangeability.

• International Trade and Compliance
  Adoption of internationally recognized requirements helps companies demonstrate conformity for market access and supports mutual recognition across regions.

Related Standards

• ISO 8624 – Spectacle frames - Measuring system and terminology.
• ISO 11979 – Ophthalmic implants standards.
• ISO 14889 – Ophthalmic optics – Spectacle lenses – Fundamental requirements.
• ISO 21987 – Ophthalmic optics – Mounted lenses – Mechanical requirements.

By aligning with SIST EN ISO 11380:2000, professionals in the optical industry uphold consistency, precision, and international compatibility in the manufacture and fitting of spectacle lenses. This enhances product reliability, safety, and end-user satisfaction in ophthalmic optics.