ISO 9241-333:2017

Overview

ISO 9241-333:2017 - Ergonomics of human-system interaction - Part 333 - specifies ergonomic performance requirements and test methods for stereoscopic displays using glasses (designed to produce or facilitate binocular parallax). The standard focuses on ensuring comfortable, effective viewing and reducing visual fatigue from stereoscopic images. It applies to temporally or spatially interlaced displays implemented by flat-panel and projection systems and concentrates on business and home leisure use in dark environments. Annex B lists measurement procedures; Annex C provides technical explanations of display technologies.

Key topics and technical requirements

• Viewing conditions: design viewing distance and recommended viewing direction ranges to support comfortable stereoscopic perception.
• Luminance: ambient illuminance and display luminance requirements and measurement guidance.
• Visual artefacts and fidelity: assessment of luminance non‑uniformity and general image fidelity.
• Interocular performance: methods to quantify interocular luminance difference and interocular crosstalk, both critical for minimizing visual fatigue.
• Optical laboratory test methods and metrology: structured procedures for measurements (alignment, test patterns, measurement field, angular aperture, meter time response, light measuring devices). Specific measurement procedures are referenced (e.g., P 333.1, P 334.1, P 337.1, P 338.1).
• Analysis and conformance: defined compliance routes, conformance assessment, and reporting for design evaluation.

Practical applications

• Design and evaluation of stereoscopic TVs, monitors, projectors and other display systems that require glasses (active or passive).
• Laboratory testing and quality assurance for display manufacturers and component suppliers to verify ergonomic performance and reduce visual fatigue risks.
• Product specification and procurement: buying or certifying displays for gaming, business visualization, simulation, and media playback in dark viewing environments.
• Guidance for ergonomists, human factors engineers and test labs developing measurement protocols and conformance reports.

Who should use this standard

• Display and consumer electronics manufacturers
• Ergonomics and human factors specialists
• Test laboratories and QA teams performing optical and visual performance measurements
• System integrators and product managers specifying stereoscopic display requirements

Related standards

• ISO 9241 series (ergonomics of human‑system interaction) - see Annex A for an overview
• ISO 9241-303 (head-mounted displays) and ISO/TR 9241-331 (autostereoscopic displays) as closely related documents for other stereoscopic technologies

Keywords: ISO 9241-333, stereoscopic displays, ergonomics, visual fatigue, interocular crosstalk, luminance uniformity, conformance, test methods.