A previous partnership has made it possible to develop a retinal camera allowing precise and non-invasive measurement of oxygen concentration in the human eye which makes it easier to detect different ocular pathologies. We now want to design and implement a miniature functional engineering model of these measures. The miniaturization of this device would allow measurements of the oxygen level in different operating environments previously inaccessible due to the size of the device. For example, this tool could be used in a emergency context or be included in the first responder emergency kit.