BS EN ISO 8596:1996 - Visual acuity test types. Specification for Landolt ring optotype for non-clinical purposes
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BS EN ISO 8596:1996 is a European Standard that specifies the Landolt ring optotype for non-clinical purposes. Landolt rings are a type of visual acuity test used to measure a person's visual acuity, particularly their ability to discern details and read letters or symbols at a distance. This standard provides specifications for the design and use of Landolt ring optotypes for non-clinical purposes, such as vision screening in occupational settings or during driver's license testing.
Key points covered by BS EN ISO 8596:1996 include:
The standard defines the scope, which is specific to Landolt ring optotypes used for non-clinical purposes.
Design: It provides detailed specifications for the design of the Landolt ring optotype, including the dimensions, spacing, and orientation of the rings. The Landolt ring consists of a single gap (an opening) in a ring shape, and its design is critical for accurate visual acuity testing.
Optical Properties: The standard may specify optical properties of the optotype, such as its size and contrast, to ensure consistent and reliable testing.
Display and Use: It may include guidelines for how the Landolt ring optotype should be displayed and used during vision screening or testing. This can include recommendations for viewing distance and lighting conditions.
Symbol Set: BS EN ISO 8596:1996 may define a set of Landolt ring symbols that can be used for testing purposes.
Landolt rings are a widely recognized and standardized way to assess visual acuity. This standard helps ensure that Landolt ring optotypes used in non-clinical settings adhere to specific design and usage criteria, promoting consistent and reliable vision testing.
