ISO 10938:2016 PDF

Ophthalmic optics — Chart displays for visual acuity measurement — Printed, projected and electronic

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Title (English):

ISO 10938:2016

Ophthalmic optics — Chart displays for visual acuity measurement — Printed, projected and electronic

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 6
Publication date:: September 22, 2016
Edition:: ISO IS 10938 edition 2 version 1
ICS:: 11.040.70

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Description (English):

ISO 10938:2016 applies to displays of optotypes generated by chart projectors and all other visual acuity measurement systems that use recognition of high-contrast optotypes and that are designed for general use, including optotypes printed on media (either opaque or intended for transillumination), those generated electronically, and those produced by optical projection.

Technical details

Technical committee: ISO/TC 172/SC 7 - Ophthalmic optics and instruments
SKU: ISO 10938:2016

Abstract

Overview

ISO 10938:2016 - Ophthalmic optics - Chart displays for visual acuity measurement - printed, projected and electronic - specifies requirements for high‑contrast optotypes used in clinical visual acuity charts. It applies to optotypes presented on printed media (opaque or transilluminated), optical chart projectors and electronic displays designed for general clinical use. The standard sets performance, measurement and documentation rules that help ensure consistent, reliable visual acuity testing across devices and settings.

Key topics and technical requirements

Optotypes: Sizes must be specified by a critical dimension (e.g., Landolt ring gap). Comparability with the standard optotype (ISO 8596) is recommended.
Background luminance: Specified range 80–320 cd/m² (recommended 200 cd/m²). Luminance uniformity limits are defined near the optotype and across the field.
Contrast: Optotype luminance must be ≤ 15% of the background luminance (accounting for room lighting). Optotypes must have sharply defined edges at specified observation distances.
Printed charts: Manufacturer must state the designed test distance.
Projected charts: Resolution requirement expressed as line/mm - minimum is 4× the spatial frequency corresponding to the limb width of the 1.0 decimal optotype. Focus range required: 2.9 m to 6.1 m. Manufacturer must specify suitable projector screens.
Electronic displays: Pixel size must be small enough that displayed optotypes perform equivalently to those meeting contrast and edge requirements. Notes address greyscaling/anti‑aliasing effects and calibration tolerance (ISO 8596 allows ±5% optotype size variability).
Range of compliance: Manufacturer must specify the test distances and acuity grades covered (recommended minimum range 0.1–1.25 decimal acuity).
Conformity & test methods: All tests are type tests. Measuring instruments should have error

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Optotypes: Sizes must be specified by a critical dimension (e.g., Landolt ring gap). Comparability with the standard optotype (ISO 8596) is recommended.
Background luminance: Specified range 80–320 cd/m² (recommended 200 cd/m²). Luminance uniformity limits are defined near the optotype and across the field.
Contrast: Optotype luminance must be ≤ 15% of the background luminance (accounting for room lighting). Optotypes must have sharply defined edges at specified observation distances.
Printed charts: Manufacturer must state the designed test distance.
Projected charts: Resolution requirement expressed as line/mm - minimum is 4× the spatial frequency corresponding to the limb width of the 1.0 decimal optotype. Focus range required: 2.9 m to 6.1 m. Manufacturer must specify suitable projector screens.
Electronic displays: Pixel size must be small enough that displayed optotypes perform equivalently to those meeting contrast and edge requirements. Notes address greyscaling/anti‑aliasing effects and calibration tolerance (ISO 8596 allows ±5% optotype size variability).
Range of compliance: Manufacturer must specify the test distances and acuity grades covered (recommended minimum range 0.1–1.25 decimal acuity).
Conformity & test methods: All tests are type tests. Measuring instruments should have error

ISO 10938:2016 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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