ISO 10322-1:2016

Overview

ISO 10322-1:2016 - Ophthalmic optics - Semi‑finished spectacle lens blanks - Part 1 defines the optical and geometrical requirements for semi‑finished single‑vision and multifocal spectacle lens blanks. It sets tolerances, measurement methods and marking/identification rules relevant to manufacturers, optical laboratories and quality assurance teams in the eyewear supply chain.

Key topics and technical requirements

• Scope and classification: Applies to semi‑finished single‑vision and multifocal lens blanks (including blanks that will be finished into spectacle lenses).
• Reference conditions: Measurements apply at 23 °C ± 5 °C and at reference wavelengths per ISO 7944. The manufacturer should specify a reference point (geometric centre assumed if not).
• Surface power tolerances (examples): Surface power tolerances are expressed in dioptres (D) in the material’s refractive index and measured by reflection:
  • 0.00–2.00 D: ±0.09 D

  • 2.00–10.00 D: ±0.06 D

  • 10.00–15.00 D: ±0.09 D

  • 15.00–20.00 D: ±0.12 D

  • 20.00 D: ±0.25 D

  • Intended surface cylindrical power tolerance examples: ≥0.25–4.00 D ±0.06 D; >4.00–6.00 D ±0.09 D; >6.00 D ±0.12 D.
• Addition (ADD) tolerances for multifocals:
  • ≤4.00 D: ±0.12 D

  • 4.00 D: ±0.18 D

• Uniformity: For nominally spherical surfaces, surface power must not deviate by more than ±0.06 D over a 40 mm diameter zone around the reference point.
• Geometrical tolerances:
  • Effective size: dn − 1 mm ≤ de ≤ dn + 2 mm (nominal dn).
  • Usable size: du ≥ dn − 1 mm (dn ≤ 65 mm); du ≥ dn − 2 mm (dn > 65 mm).
  • Centre and edge thickness: not less than manufacturer’s minimum and not exceed it by more than 3 mm.
  • Multifocal segment dimensions: ±0.5 mm (pair difference ≤0.7 mm); segment position ±1.0 mm.
• Test methods: Surface power by reflection instruments, addition measurement by surface methods or focimeter (Annex C), conversion for instrument refractive‑index differences (Annex B). Alternative methods allowed if equivalent.
• Marking & identification: Requirements for lens blank marking and package information to ensure traceability.

Applications and users

• Who uses it: lens blank manufacturers, spectacle lens laboratories, optical quality control teams, eyewear suppliers, regulators and conformity assessors.
• Why it matters: Ensures consistent optical performance, interchangeability of blanks, reliable finishing to prescription, reduced remakes, and compliance with international ophthalmic optics practice.

Related standards

• ISO 7944 (reference wavelengths)
• ISO 8598‑1 (focimeters)
• ISO 13666 (ophthalmic optics vocabulary)

Keywords: ISO 10322-1:2016, ophthalmic optics, semi‑finished spectacle lens blanks, single‑vision lens blanks, multifocal lens blanks, surface power tolerances, addition power, geometrical tolerances, test methods.