Ophthalmic optics and instruments. Optical devices for low-vision aids Ingestion-build-50790 It also gives basic guidance

It also gives basic guidance for the selection of immunity levels

as a result of which improved quality of inner surfaces of the planar cores has been taken into consideration

What is ISO/TR 9241‑393 about

The Plan documents the Plan owner’s processes to assure their customers and all other stakeholders that the Plan owner’s products will continue to meet their requirements

Ophthalmic optics and instruments. Optical devices for low-vision aids Ingestion-build-50790 It also gives basic guidance1 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