Overview
The EN ISO 10943:2023 standard, titled Ophthalmic instruments - Indirect ophthalmoscopes (ISO 10943:2023), issued by CEN, defines minimum requirements and test methods for indirect ophthalmoscopes. This international standard applies specifically to hand-held, spectacle-type, and head-worn indirect ophthalmoscopes used for observing indirect images of the eye fundus. It supersedes the previous EN ISO 10943:2011 edition and takes precedence over ISO 15004-1 and ISO 15004-2 in case of conflicting provisions.
This standard excludes condensing lenses, accessories, table-mounted instruments (e.g., Gullstrand ophthalmoscopes), and ophthalmoscopes primarily designed for image capture or advanced scanning laser techniques.
Key Topics
Scope and Applicability
- Covers indirect ophthalmoscopes including hand-held, spectacle-type, and head-worn models.
- Excludes condensing lenses and accessories.
- Does not apply to table-mounted devices or image-capturing ophthalmoscopes.
Optical and Dimensional Requirements
- Specifies parameters such as:
- Interpupillary distance range: 55 mm to 72 mm
- Diameter of field of view: ≥100 mm for hand-held use; 150 mm to 250 mm for integral condensing systems
- Diameter of illumination spot: ≥45 mm for hand-held systems
- Defines tolerances on binocular indirect ophthalmoscopes for interpupillary distance, optical axis orientation, and magnification differences (max ±5%).
Construction and Functional Requirements
- Light output must be adjustable between maximum and 10% of maximum level.
- Free from visible reflections or scattered light.
- Illumination alignment to viewing system within 1° vertically.
- Homogeneous and achromatic light beam.
- Matching brightness and colour for binocular systems.
Safety and Light Hazard Protection
- Strict evaluation of optical radiation hazards in accordance with ISO 15004-2.
- Testing performed with manufacturer-specified condensing lenses representing the worst-case scenario for light safety.
- Ensures ophthalmic safety compliance for light exposure during eye examination.
Test Methods
- Includes type tests for optical, mechanical, and functional criteria.
- Measurements require high-accuracy instruments with less than 10% relative error.
- Applies statistical evaluation methods per ISO/IEC guidelines on measurement uncertainty.
Documentation and Marking
- Accompanying documents must provide:
- Manufacturer’s name and address
- Usage instructions referencing EN ISO 10943:2023 compliance
- Specification of compatible condensing lenses
- Permanent marking on devices with manufacturer details, model, and IEC 60601-1 required symbols.
Applications
The EN ISO 10943:2023 standard is essential for manufacturers, designers, and quality assurance professionals involved in the development and production of indirect ophthalmoscopes used in:
- Clinical ophthalmology and optometry practices
- Eye fundus examination procedures
- Diagnostic imaging where indirect visualization of retina and internal eye structures is required
- Ensuring medical device compliance for ophthalmic instruments used worldwide
Medical device manufacturers utilize this standard to align their product specifications with global safety, optical precision, and performance criteria, facilitating regulatory approvals and market access.
Related Standards
- ISO 15004-1 - General requirements and test methods for all ophthalmic instruments.
- ISO 15004-2 - Requirements and test methods for light hazard protection in ophthalmic instruments.
- IEC 60601-1 - General requirements for basic safety and essential performance of medical electrical equipment.
- ISO/IEC Guide 98-3 - Guide to expression of measurement uncertainty, important for validating test precision.
Compliance with EN ISO 10943:2023 ensures that indirect ophthalmoscopes meet harmonized European and international safety, functionality, and optical quality standards, supporting consistent clinical outcomes and patient safety in ophthalmic diagnostics.
Keywords: EN ISO 10943:2023, indirect ophthalmoscopes standard, ophthalmic instruments, eye fundus examination, optical safety, medical device standards, binocular indirect ophthalmoscopes, ophthalmic optics, light hazard protection, ophthalmic equipment compliance.