Ophthalmic instruments. Trial frames1 Scope This International Standard, together with ISO 15004 1, specifies minimum requirements and test methods for trial frames for holding trial case lenses, complying with ISO 9801, in front of a subject's eyes in order to assess visual acuity and facilitate optical correction of vision. This International Standard is applicable to lens holders mounted on headbands, bracket mounted frames and frames mounted in the manner of spectacles with supports

against excessive flow and pressure)

varnishes and lacquers with or without fungicidal additives

Annex A (informative) Cross reference index of alternative terms

BS EN 62273-1 contains details of specially selected methods for determining the most important performance parameters of digital transmitters

The application itself is designed to allow the efficient and language independent transmission of public transport information either directly to an end-user

airflow calculations

it is important

and a track format to be used on 130 mm (5

4 Safety device

BS 6031 is non-conflicting complementary information (NCCI) to BS EN 1997-1

shower basins

Communication device manufacturers