BS ISO 5868-2025 PDF

Full title and description

STB BS ISO 5868-2025 — Ophthalmic optics and instruments — Anomaloscopes for the diagnosis of red‑green colour vision deficiencies. This designation indicates the International Standard ISO 5868:2025 and its national adoptions (BS ISO 5868:2025 and listings that use the STB prefix), and specifies requirements for anomaloscopes used to assess red–green (Rayleigh) colour‑vision matches.

Abstract

This standard applies to anomaloscopes used to examine red–green colour vision by investigating the colour match of a red+green mixture compared with yellow (the Rayleigh equation). It specifies optical and technical parameters of physiological relevance so that measured values on an examinee’s eye are independent of the technical characteristics of the anomaloscope used. The aim is to ensure comparability, repeatability and minimum performance requirements for diagnostic anomaloscopes.

General information

• Status: Published / Active.
• Publication date: May 2025 (ISO publication May 2025; BS national publication 29 May 2025).
• Publisher: International Organization for Standardization (ISO); nationally published/adopted as BS ISO 5868:2025 by the British Standards Institution (BSI). The "STB" prefix is used in catalogues and indicates national/state standard listings (e.g., Belarusian STB designation) where national adoption or listing has been recorded.
• ICS / categories: 11.040.70 — Ophthalmic optics and instruments.
• Edition / version: Edition 1 (ISO 5868:2025, first edition).
• Number of pages: ISO technical text: 11 pages (ISO published version); BS ISO national publication typically includes a national foreword and administrative material (BS version listed as ~20 pages in national catalogues).

Scope

ISO 5868:2025 covers anomaloscopes intended for the diagnosis of red–green colour‑vision deficiencies. It defines the optical and technical parameters and minimum performance and calibration requirements necessary to ensure that test results reflect the examinee’s colour‑vision characteristics rather than variations in instrument construction or settings (Rayleigh match tests and related measurement conditions are described and constrained by the standard).

Key topics and requirements

• Definition of the Rayleigh match method as applied to anomaloscopes and required measurement geometry and viewing conditions.
• Specifications for spectral, photometric and radiometric characteristics of light sources and filters used in anomaloscopes (to ensure physiological relevance and inter‑instrument comparability).
• Calibration procedures and reference checks to guarantee stability and traceability of measurements over time.
• Performance limits and tolerances for optical elements, matching fields, luminance control and colourimetric settings.
• Requirements for documentation, marking and user information necessary for reliable clinical use and interpretation of results.

Typical use and users

Primary users are manufacturers of ophthalmic diagnostic instruments (anomaloscopes), clinical and occupational eye‑care practitioners, hospital and clinic electro‑diagnostic units, vision‑screening laboratories, test and calibration laboratories, and regulatory or procurement bodies specifying equipment performance for occupational health and clinical screening programs.

Related standards

Standards commonly referenced alongside ISO 5868 include other ophthalmic optics standards for visual‑function testing and instrument specifications — for example ISO 8596 (visual acuity testing — optotypes and presentation) and relevant parts of ISO 8980 (spectacle lenses and optical test methods) and other ISO/TC 172 series documents on ophthalmic instruments. Users should consult the ISO catalogue and national standards bodies for the normative references within ISO 5868:2025.

Keywords

Anomaloscope; colour vision; red‑green deficiency; Rayleigh match; ophthalmic optics; diagnostic instrument; calibration; ISO 5868; BS ISO 5868; STB.

FAQ

Q: What is this standard?

A: ISO 5868:2025 is an international standard that specifies requirements for anomaloscopes used to diagnose red–green colour‑vision deficiencies (Rayleigh match). It has been published as an ISO International Standard and adopted/published nationally (for example as BS ISO 5868:2025).

Q: What does it cover?

A: It covers instrument optical and technical parameters, measurement and calibration requirements, performance tolerances and user documentation needed to ensure that anomaloscope test results reflect the subject’s colour vision rather than instrument variability.

Q: Who typically uses it?

A: Instrument manufacturers, clinical eye‑care professionals, vision screening laboratories, calibration/test laboratories, and procurement/regulatory bodies that specify or assess anomaloscope performance.

Q: Is it current or superseded?

A: It is current (published in 2025). Users should check national standards catalogues or the ISO catalogue for any subsequent amendments or revisions. The British adoption (BS ISO 5868:2025) was published in late May 2025.

Q: Is it part of a series?

A: It is part of ISO work in ophthalmic optics and instruments (ISO/TC 172/SC 7 and related ISO optics/ophthalmic standards). Related standards on visual testing and ophthalmic instrument specifications are published under the same ICS grouping (11.040.70).

Q: What are the key keywords?

A: Anomaloscope, Rayleigh equation, red‑green colour vision deficiency, ophthalmic optics, calibration, diagnostic instrument, ISO 5868, BS ISO 5868, STB.