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 for enhancing low vision are specified in ISO 15254, Ophthalmic optics and instruments — Electro-optical devices for low vision.