Iridex TruFocus LIO Premiere" Laser Indirect Ophthalmoscope ( LIO ) The LIO is a headmounted indirect ophthalmoscope which is used with a handheld lens to view and perform laser treatments on a patient s retina. It allows binocular visualization of the peripheral retina and can be used to evaluate and treat patients. Class I - Dangerous It was discovered that the laser energy was not going where intended to put it, resulting in focal cataracts and iris burns. Feb 27, 2018 Other Medical Devices View Details →