ISO 15004-1:2006 specifies fundamental requirements for non-invasive, active and non-active ophthalmic instruments. ISO 15004-1:2006 is also applicable to low-vision aids and tonometers, but not to other ophthalmic instruments which are used in contact with the globe of the eye. ISO 15004-1:2006 is not applicable to operation microscopes, endoscopes and devices intended for laser investigation or laser treatment of the eye.