A diagnostic medical tool is described that allows patients to non-invasively observe. describe and document their own retinal blood vessels using the Purkinje vascular entoptic test. We envision key applications of the Purkinje retinal image stabilization (PRIS) device in monitoring of diabetic retinopathy and cost-effective assessment of retinal visual acuity. To optimize our PRIS p... https://foldlyers.shop/product-category/hdmi/