Ophthalmic optics and instruments. Optical devices for low-vision aids1 Scope This International Standard applies to optical devices specified by the manufacturer for use by visually impaired persons as optical low vision aids. It specifies the optical and mechanical requirements and test methods for such devices, including optical devices with electrical components such as illuminators. It does not apply to electro optical devices for enhancing low vision. NOTE Requirements and test methods for electro optical devices

and similar organizations through a number of devices and the communication links between them

air quality levels and number of vehicles entered

Requirements for portable general purpose luminaries

If a surface or near-surface flaw is present

product specifications

This guide is not intended to describe all existing forms of product certification

essential that equipment and instrumentation of appropriate accuracy be used

quality assessment

8 to 25 mm inclusive

where the driving point stiffness and the transfer stiffness are equal

General principles with regard to cathodic protection are described in EN 12954

BS IEC 62899-502-1 can guide you in conducting the mechanical stress test for organic light emitting diode (OLED) elements